Federal Leadership

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The President’s Cabinet

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California State Leadership

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Leadership Timeline

YEAR FEDERAL OFFICES CALIFORNIA VOTING HABITS STATE OFFICIALS
PRESIDENT NO. SENATE HOUSE SUPREME COURT PRESIDENT SENATE HOUSE GOVERNOR SENATE ASSEMBLY
2028
2027
2026 Gavin Newsom (D)
Eleni Kounalakis (D)
2025
2024 D 40
R 12


118th Congress
United States House of Representatives
January 3, 2023 to January 3, 2025
California Delegation (52 Seats)

Democratic: 40
Republican: 12


California State Senate
2023-24 Session
December 7, 2022 to present
Democratic Majority

President: Eleni Kounalakis (D)
President Pro Tempore: Mike McGuire (D, Geyserville) from Feb. 5, 2024
      Toni Atkins (D, San Diego) until Feb. 5, 2024
Majority Leader: Lena Gonzalez (D, Long Beach) from Feb. 8, 2024
      Mike McGuire (D, Geyserville) until Feb. 5, 2024
Minority Leader: Brian Jones (R, Santee)

Democratic: 32
Republican: 8


California State Assembly
2023-24 Session
December 7, 2022 to present
Democratic Majority

Speaker: Robert A. Rivas (D, Hollister) from Jun. 30, 2023
      Anthony Rendon (D, Lakewood) until Jun. 30, 2023
Speaker Pro Tempore: Jim Wood (D, Healsburg) from Nov. 22, 2023
      Cecilia Aguiar-Curry (D, Winters) Jul. 3, 2023 to Nov. 22, 2023
      Chris Ward (D, San Diego) until Jul. 3, 2023
Majority Leader: Cecilia Aguiar-Curry (D, Winters) from Nov. 22, 2023
      Isaac Bryan (D, Jefferson Park) Jul. 3, 2023 to Nov. 22, 2023
      Eloise Reyes (D, Colton) until Jul. 3, 2023
Minority Leader: James Gallagher (R, Yuba City)

Democratic: 62
Republican: 18

D 32
R 8
D 62
R 18
2023
2022
Gavin C. Newsom (D)
40th Governor of the State of California
January 7, 2019 to present

Re-Elected on November 8, 2022 (59.18%-40.82%)
Defeated Recall Election on September 14, 2021 (61.88%-38.12%)
Elected on November 6, 2018 (61.95%-38.05%)

Lieutenant Governor: Eleni Kounalakis (D)

D 42
R 11


117th Congress
United States House of Representatives
January 3, 2021 to January 3, 2022
California Delegation (53 Seats)

Democratic: 42
Republican: 11


California State Senate
2021-22 Session
December 7, 2020 to November 30, 2022
Democratic Majority

President: Eleni Kounalakis (D)
President Pro Tempore: Toni Atkins (D, San Diego)
Majority Leader: Mike McGuire (D, Geyserville) from Jan. 19, 2022
      Robert Hertzberg (D, Van Nuys) until Jan. 19, 2022
Minority Leader: Scott Wilk (R, Santa Clarita) from Jan. 20, 2021
      Shannon Grove (R, Bakersfield) until Jan. 20, 2021

Democratic: 31
Republican: 9


California State Assembly
2023-24 Session
December 7, 2020 to November 30, 2022
Democratic Majority

Speaker: Anthony Rendon (D, Lakewood)
Speaker Pro Tempore: Kevin Mullin (D, South San Francisco)
Majority Leader: Eloise Reyes (D, Colton)
Minority Leader: James Gallagher (R, Yuba City) from Feb. 8, 2022
      Marie Waldron (R, Escondido) until Feb. 8, 2022

Democratic: 60
Republican: 19
Independent: 1

D 31
R 9
D 60
R 19
I 1
2021
2020 D 46
R 7


116th Congress
United States House of Representatives
January 3, 2019 to January 3, 2021
California Delegation (53 Seats)

Democratic: 46
Republican: 7


California State Senate
2019-20 Session
December 3, 2018 to November 30, 2020
Democratic Majority

President: Eleni Kounalakis (D) from Jan. 7, 2019
      Gavin Newsom (D) until Jan. 7, 2019
President Pro Tempore: Toni Atkins (D, San Diego)
Majority Leader: Robert Hertzberg (D, Van Nuys) from Jan. 7, 2019
      Bill Monning (D, Carmel-by-the-Sea) until Jan. 7, 2019
Minority Leader: Shannon Grove (R, Bakersfield) from Mar. 1, 2019
      Patricia Bates (R, Laguna Niguel) until Mar. 1, 2019

Democratic: 29
Republican: 11


California State Assembly
2019-20 Session
December 3, 2018 to November 30, 2020
Democratic Majority

Speaker: Anthony Rendon (D, Lakewood)
Speaker Pro Tempore: Kevin Mullin (D, South San Francisco)
Majority Leader: Ian Calderon (D, Whittier)
Minority Leader: Marie Waldron (R, Escondido)

Democratic: 60
Republican: 20

D 29
R 11
D 60
R 20
2019
2018 D 39
R 14


115th Congress
United States House of Representatives
January 3, 2017 to January 3, 2019
California Delegation (53 Seats)

Democratic: 39
Republican: 14


California State Senate
2017-18 Session
December 5, 2016 to November 30, 2018
Democratic Majority

President: Gavin Newsom (D)
President Pro Tempore: Toni Atkins (D, San Diego) from Mar. 21, 2018
      Kevin de León (D, Los Angeles) until Mar. 21, 2018
Majority Leader: Bill Monning (D, Carmel-by-the-Sea)
Minority Leader: Patricia Bates (R, Laguna Niguel) from Apr. 12, 2017
      Jean Fuller (R, Bakersfield) until Apr. 12, 2017

Democratic: 27
Republican: 13


California State Assembly
2017-18 Session
December 5, 2016 to November 30, 2018
Democratic Majority

Speaker: Anthony Rendon (D, Lakewood)
Speaker Pro Tempore: Kevin Mullin (D, South San Francisco)
Majority Leader: Ian Calderon (D, Whittier)
Minority Leader: Marie Waldron (R, Escondido) from Nov. 8, 2018
      Brian Dahle (R, Bieber) Sept. 18, 2017 to Nov. 8, 2018
from Apr. 12, 2017
      Chad Mayes (R, Yucca Valley) until Sept. 18, 2017


Democratic: 55
Republican: 25

Jerry Brown (D)
Gavin Newsom (D)
D 27
R 13
D 55
R 25
2017
2016 D 38
R 15


114th Congress
United States House of Representatives
January 3, 2015 to January 3, 2017
California Delegation (53 Seats)

Democratic: 38
Republican: 15


California State Senate
2015-16 Session
December 1, 2014 to November 30, 2016
Democratic Majority

President: Gavin Newsom (D)
President Pro Tempore: Kevin de León (D, Los Angeles)
Majority Leader: Bill Monning (D, Carmel-by-the-Sea) from Dec. 17, 2014
      Vacant until Dec. 17, 2014
Minority Leader: Jean Fuller (R, Bakersfield) from Aug. 27, 2015
      Bob Huff (R, San Dimas) until Aug. 27, 2015

Democratic: 26
Republican: 14


California State Assembly
2015-16 Session
December 1, 2014 to November 30, 2016
Democratic Majority

Speaker: Anthony Rendon (D, Lakewood) from Mar. 7, 2016
      Toni Atkins (D, San Diego) until Mar. 7, 2016
Speaker Pro Tempore: Kevin Mullin (D, South San Francisco)
Majority Leader: Ian Calderon (D, Whittier) from Mar. 10, 2016
      Chris Holden (D, Pasadena) until Mar. 10, 2016
Minority Leader: Chad Mayes (R, Yucca Valley) from Jan. 4, 2016
      Kristin Olsen (R, Riverbank) until Jan. 4, 2016

Democratic: 52
Republican: 28

D 26
R 14
D 52
R 28
2015
2014
Edmund G. "Jerry" Brown Jr. (D)
39th Governor of the State of California
34th Governor of the State of California
January 3, 2011 to January 7, 2019
January 6, 1975 to January 3, 1983

Re-Elected on November 4, 2014 (59.97%-40.03%)
Elected on November 2, 2010 (53.77%-40.88%)
Re-Elected on November 7, 1978 (56.05%-36.50%)
Elected on November 5, 1974 (50.11%-47.25%)

Lieutenant Governor: Gavin Newsom (D) from January 10, 2011
      Vacant January 3, 2011 to January 10, 2011
      Michael Curb January 8, 1979 to January 3, 1983
      Mervyn M. Dymally until January 8, 1979

D 34
R 19


113th Congress
United States House of Representatives
January 3, 2013 to January 3, 2015
California Delegation (53 Seats)

Democratic: 34
Republican: 19


California State Senate
2013-14 Session
December 3, 2012 to November 30, 2014
Democratic Majority

President: Gavin Newsom (D)
President Pro Tempore: Kevin de León (D, Los Angeles) from Oct. 15, 2014
      Darrell Steinberg (D, Sacramento) until Oct. 15, 2014
Majority Leader: Ellen Corbett (D, Hayward)
Minority Leader: Bob Huff (R, Diamond Bar)

Democratic: 29
Republican: 11


California State Assembly
2013-14 Session
December 3, 2012 to November 30, 2014
Democratic Majority

Speaker: Toni Atkins (D, San Diego) from May 12, 2014
      John Pérez (D, Los Angeles) until May 12, 2014
Speaker Pro Tempore: Nora Campos (D, San José)
Majority Leader: V. Manuel Perez (D, Coachella) from May 12, 2014
      Toni Atkins (D, San Diego) until May 12, 2014
Minority Leader: Kristin Olsen (R, Modesto) from Nov. 6, 2014
      Connie Conway (R, Tulare) until Nov. 6, 2014

Democratic: 55
Republican: 25

D 29
R 11
D 55
R 25
2013
2012 D 34
R 19


112th Congress
United States House of Representatives
January 3, 2011 to January 3, 2013
California Delegation (53 Seats)

Democratic: 34
Republican: 19


California State Senate
2011-12 Session
December 6, 2010 to November 30, 2012
Democratic Majority

President: Gavin Newsom (D) from Jan. 10, 2011
      Vacant Jan. 3, 2011 to Jan. 10, 2011
      Abel Maldenado (R) until Jan. 3, 2011
President Pro Tempore: Darrell Steinberg (D, Sacramento)
Majority Leader: Ellen Corbett (D, San Leandro)
Minority Leader: Bob Huff (R, Diamond Bar) from Jan. 5, 2012
      Robert Dutton (R, Rancho Cucamonga) until Jan. 5, 2012

Democratic: 25
Republican: 15


California State Assembly
2011-12 Session
December 6, 2010 to November 30, 2012
Democratic Majority

Speaker: John Pérez (D, Los Angeles)
Speaker Pro Tempore:Nora Campos (D, San José) from Aug. 10, 2012
      Fiona Ma (D, San Francisco) until Aug. 10, 2012
Majority Leader: Toni Atkins (D, San Diego) from Sept. 1, 2012
      Charles Calderon (D, Whittier) until Sept. 1, 2012
Minority Leader: Connie Conway (R, Tulare)

Democratic: 52
Republican: 28

D 25
R 15
D 52
R 28
2011
2010 D 34
R 19


111th Congress
United States House of Representatives
January 3, 2009 to January 3, 2011
California Delegation (53 Seats)

Democratic: 34
Republican: 19


California State Senate
2009-10 Session
December 1, 2008 to November 30, 2010
Democratic Majority

President: Abel Maldonado (R) from Apr. 27, 2010
      Vacant Nov. 5, 2009 to Apr. 27, 2010
      John Garamendi (D) until Nov. 5, 2009
President Pro Tempore: Darrell Steinberg (D, Sacramento)
Majority Leader: Dean Florez (D, Shafter)
Minority Leader: Robert Dutton (R, Rancho Cucamonga) from Oct. 11, 2010
      Dennis Hollingsworth (R, Murrieta) Feb. 18, 2009 to Oct. 11, 2010
      Dave Cogdill (R, Modesto) until Feb. 18, 2009

Democratic: 25
Republican: 15


California State Assembly
2009-10 Session
December 1, 2008 to November 30, 2010
Democratic Majority

Speaker: John Pérez (D, Los Angeles) from Mar. 1, 2010
      Karen Bass (D, Los Angeles) until Mar. 1, 2010
Speaker Pro Tempore:Fiona Ma (D, San Francisco) from Mar. 18, 2010
      Lori Saldaña (D, San Diego) until Mar. 18, 2010
Majority Leader: Charles Calderon (D, Whittier) from Mar. 18, 2010
      Alberto Torrico (D, Newark) until Mar. 18, 2010
Minority Leader: Martin Garrick (R, Carlsbad) from Feb. 1, 2010
      Sam Blakeslee (R, San Luis Obispo) Jun. 1, 2009 to Feb. 1, 2010
      Michael Villines (R, Clovis) until Jun. 1, 2009

Democratic: 50
Republican: 29
Independent: 1

Arnold Schwarzenegger (R)
Abel Maldonado (R); 2010-11
Mona Pasquil (D); 2009-10
John Garamendi (D); 2007-09
Cruz Bustamante (D); 2003-07
D 25
R 15
D 50
R 29
I 1
2009
2008 D 34
R 19


110th Congress
United States House of Representatives
January 3, 2007 to January 3, 2009
California Delegation (52 Seats)

Democratic: 34
Republican: 19


California State Senate
2007-08 Session
December 4, 2006 to August 30, 2008
Democratic Majority

President: John Garamendi (D)
President Pro Tempore: Don Perata (D, Oakland)
Majority Leader: Gloria Romero (D, East Los Angeles)
Minority Leader: Dave Cogdill (R, Modesto) from Apr. 15, 2008
      Dick Ackerman (R, Irvine) until Apr. 15, 2008

Democratic: 25
Republican: 15


California State Assembly
2007-08 Session
December 4, 2006 to August 30, 2008
Democratic Majority

Speaker: Karen Bass (D, Los Angeles) from May 13, 2008
      Fabian Núñez (D, Los Angeles) until May 13, 2008
Speaker Pro Tempore: Sally J. Lieber (D, Mountain View)
Majority Leader: Alberto Torrico (D, Newark) from May 13, 2008
      Karen Bass (D, Los Angeles) until May 13, 2008
Minority Leader: Michael Villines (R, Clovis)

Democratic: 48
Republican: 32

D 25
R 25
D 48
R 32
2007
2006 D 33

Arnold A. Schwarzenegger (R)
38th Governor of the State of California
November 17, 2003 to January 3, 2011

Re-Elected on November 7, 2006 (55.88%-38.91%)
Elected on October 7, 2003 (44.68%-28.95%)
Recall of Gov. Davis succeeded on October 7, 2003 (55.39%-44.61%)

Lieutenant Governor: Abel Maldenado (R) from April 27, 2010
      Mona Pasquil (D) Acting from November 4, 2009 to April 27, 2010
      John Garamendi (D) January 8, 2007 to November 3, 2009
      Cruz Bustamante (D) until January 8, 2007

R 20


109th Congress
United States House of Representatives
January 3, 2005 to January 3, 2007
California Delegation (53 Seats)

Democratic: 33
Republican: 20


California State Senate
2005-06 Session
December 6, 2004 to November 30, 2006
Democratic Majority

President: Cruz Bustamante (D)
President Pro Tempore: Don Perata (D, Oakland)
Majority Leader: Gloria Romero (D, East Los Angeles)
Minority Leader: Dick Ackerman (R, Irvine)

Democratic: 25
Republican: 15


California State Assembly
2005-06 Session
December 6, 2004 to November 30, 2006
Democratic Majority

Speaker: Fabian Núñez (D, Los Angeles)
Speaker Pro Tempore: Leland Yee (D, San Francisco)
Majority Leader: Dario Frommer (D, Long Beach)
Minority Leader: Michael Villines (R, Clovis) from Nov. 10, 2006
      George Plescia (R, San Diego) Apr. 17, 2006 to Nov. 10, 2006
      Kevin McCarthy (R, Bakersfield) until Apr. 17, 2006

Democratic: 48
Republican: 32

D 25
R 15
D 48
R 32
2005
2004 D 33
R 20


108th Congress
United States House of Representatives
January 3, 2003 to January 3, 2005
California Delegation (53 Seats)

Democratic: 33
Republican: 20


California State Senate
2003-04 Session
December 2, 2002 to November 30, 2004
Democratic Majority

President: Cruz Bustamante (D)
President Pro Tempore: John L. Burton (D, San Francisco)
Majority Leader: Don Perata (D, Oakland)
Minority Leader: Dick Ackerman (R, Irvine) from May 20, 2004
      Jim Brulte (R, Ontario) until May 20, 2004

Democratic: 25
Republican: 15


California State Assembly
2003-04 Session
December 2, 2002 to November 30, 2004
Democratic Majority

Speaker: Fabian Núñez (D, Los Angeles) from Feb. 9, 2004
      Herb Wesson (D, Los Angeles) until Feb. 9, 2004
Speaker Pro Tempore: Christine Kehoe (D, San Diego)
Majority Leader: Wilma Chan (D, Oakland)
Minority Leader: Kevin McCarthy (R, Bakersfield) from Jan. 5, 2004
      Dave Cox (R, Fair Oaks) until Jan. 5, 2004

Democratic: 48
Republican: 32

D 25
R 15
D 48
R 32
2003 Gray Davis (D)
Cruz Bustamante (D)
2002 D 32
R 20


107th Congress
United States House of Representatives
January 3, 2001 to January 3, 2003
California Delegation (52 Seats)

Democratic: 32
Republican: 20


California State Senate
2001-02 Session
December 4, 2000 to November 30, 2002
Democratic Majority

President: Cruz Bustamante (D)
President Pro Tempore: John L. Burton (D, San Francisco)
Majority Leader: Richard Polanco (D, Los Angeles)
Minority Leader: Jim Brulte (R, Ontario)

Democratic: 26
Republican: 14


California State Assembly
2001-02 Session
December 4, 2000 to November 30, 2002
Democratic Majority

Speaker: Herb Wesson (D, Los Angeles) from Feb. 6, 2002
      Robert Hertzberg (D, Los Angeles) until Feb. 6, 2002
Speaker Pro Tempore: Fred Keeley (D, Santa Cruz)
Majority Leader: Kevin Shelley (D, San Diego)
Minority Leader: Dave Cox (R, Fair Oaks) from Mar. 26, 2001
      Bill Campbell (R, Villa Park) until Mar. 26, 2001

Democratic: 50
Republican: 30

D 26
R 14
D 50
R 30
2001
2000 R 55
D 45
R 223
D 212
D 27 R 25 D 25
R 15
D 47
R 32
G 1
1999 Clinton/Gore - 51%
Dole/Kemp - 38%
Perot/Campbell - 7%
Other - 4%
D 28 R 24
1998 Newt Gingrich (R-GA) R 227
D 208
D 29
R 23
Pete Wilson (R)
Gray Davis (D); 1995-99
Leo McCarthy; 1991-95
D 23
R 16
I 1
D 43
R 37
1997
1996 R 53
D 47
R 230
D 205
D 26 R 26 D 21
R 17
I 2
R 41
D 39
1995 Clinton/Gore - 46%
Bush/Quayle - 33%
Perot/Stockdale - 21%
D 27 R 25
1994 D 57
R 43
Tom Foley (D-WA) D 259
R 176
B
L
A
C
K
M
U
N
D 30
R 22
D 23
R 15
I 2
D 48
R 34
1993 W
H
I
T
E
1992 D 56
R 44
D 268
R 167
Seymour (R) Cranston (D) D 26
R 19
D 25
R 14
I 1
D 46
R 34
1991 M
A
R
S
H
A
L
L
Bush/Quayle - 51%
Dukakis/Bentson - 48%
Other - 1%
1990 D 55
R 45
D 259
R 174
B
R
E
N
N
A
N
Wilson (R) D 28
R 17
George Deukmejian (R)
Leo McCarthy (R)
D 24
R 14
I 1
D 47
R 33
1989 Jim Wright (D-TX)
1988 D 56
R 46
D 258
R 177
D 44
R 36
1987 P
O
W
E
L
L
Reagan/Bush - 58%
Mondale/Ferraro - 41%
Other - 1%
1986 R 52
D 48
Tip O'Neill (D-MA) D 253
R 182
B
U
R
G
E
R
R
E
H
N
Q
U
I
S
T
D 25
R 15
D 47
R 33
1985
1984 R 54
D 46
D 269
R 166
D 48
R 32
1983 Reagan/Bush - 53%
Carter/Mondale - 36%
Anderson/Lucey - 9%
Other - 2%
1982 R 53
D 47
D 243
R 192
Hayakawa (R) D 22
R 21
Jerry Brown (D)
Michael Curb (R); 1979-83
Mervyn Dymally (D); 1975-79
D 26
R 14
D 47
R 33
1981 S
T
E
W
A
R
T
1980 D 59
R 41
D 276
R 159
D 28
R 15
D 50
R 30
1979 Ford/Dole - 49%
Carter/Mondale - 48%
Other - 3%
1978 D 62
R 38
D 292
R 143
D 29
R 14
D 28
R 12
D 57
R 23
1977
1976 D 61
R 39
Carl Albert (D-OK) D 291
R 144
Tunney (D) D 28
R 15
D 25
R 15
D 55
R 25
1975 D
O
U
G
L
A
S
Nixon/Agnew - 55%
McGovern/Shriver - 42%
Other - 3%
1974 D 57
R 43
D 242
R 193
D 23
R 20
Ronald Reagan (R)
John Harmer (R); 1974-75
Edwin Reinecke (R); 1969-74
Robert Finch (R); 1967-69
D 20
R 20
D 51
R 29
1973
1972 D 55
R 45
D 255
R 180
D 20
R 18
D 21
R 19
D 43
R 37
1971 B
L
A
C
K
H
A
R
L
A
N

I
I
Nixon/Agnew - 49%
Humphrey/Muskie - 45%
Wallace/LeMay - 6%
1970 D 57
R 43
John McCormack (D-MA) D 243
R 192
Murphy (R) D 21
R 17
R 21
D 19
R 41
R 39
1969 F
O
R
T
A
S
1968 D 62
R 38
D 248
R 187
W
A
R
R
E
N
Kuchel (R) D 20 R 20 D 42
R 38
1967 C
L
A
R
K
Johnson/Humphrey - 59%
Goldwater/Miller - 41%
D 21 R 19
1966 D 68
R 32
D 295
R 140
D 23
R 15
Pat Brown (D)
Glenn Anderson (D)
D 27
R 13
D 49
R 31
1965
1964 D 66
R 34
D 258
R 177
Salinger (D) D 52
R 28
1963 Nixon/Lodge - 50%
Kennedy/Johnson - 49%
Other - 1%
Engle (D)
1962 D 65
R 35
D 263
R 174
F
R
A
N
K
F
U
R
T
E
R
D 24
R 14
D 30
R 10
D 47
R 33
1961 Sam Rayburn (D-TX) W
H
I
T
T
A
K
E
R
1960 D 66
R 34
D 282
R 153
D 16
R 14
D 26
R 14
1959 Eisenhower/Nixon - 55%
Stevenson/Kefauver - 44%
Other - 1%
1958 D 49
R 47
D 234
R 201
B
U
R
T
O
N
Knowland (R) R 17
D 13
Goodwin Knight (R)
Harold Powers (R)
D 20
R 20
R 42
D 38
1957
1956 D 49
R 47
D 232
R 203
M
I
N
T
O
N
R
E
E
D
R 19
D 11
R 22
D 18
R 47
D 23
1955 Eisenhower/Nixon - 57%
Stevenson/Sparkman - 42%
Other - 1%
1954 R 49
D 47
Joseph Martin, Jr. (R-MA) R 221
D 213
I 1
J
A
C
K
S
O
N
R 29
D 11
R 53
D 27
1953 V
I
N
S
O
N
Earl Warren (R)
Goodwin Knight (R); 1947-53
Frederick Houser; 1943-47
1952 D 49
R 47
Sam Rayburn (D-TX) D 235
R 199
I 1
Nixon (R) R 12
D 11
R 28
D 12
R 47
D 33
1951 Truman/Barkley - 48%
Dewey/Warren - 47%
Other - 5%
1950 D 54
R 42
D 263
R 171
O 1
Downey (D) R 26
D 14
R 45
D 35
1949 R
U
T
L
E
D
G
E
M
U
R
P
H
Y
1948 R 51
D 45
Joseph Martin, Jr. (R-MA) R 246
D 188
O 1
R 14
D 9
R 24
D 20
R 48
D 32
1947 Roosevelt/Truman - 56%
Dewey/Bricker - 43%
Other - 1%
1946 D 57
R 38
P 1
Sam Rayburn (D-TX) D 243
R 190
O 2
D 16
R 7
R 42
D 37I 1
1945 S
T
O
N
E
R
O
B
E
R
T
S
Johnson (R)
1944 D 222
R 209
O 4
D 13
R 10
R 24
D 16
R 44
D 36
1943 Roosevelt/Wallace - 57%
Willkie/McNary - 41%
Other - 2%
1942 D 66
R 28
O 2
D 268
R 162
O 5
D 10
R 10
Culbert Olson (D)
Ellis Patterson (D)
D 42
R 38
1941 H
U
G
H
E
S
S
T
O
N
E
1940 D 69
R 23
O 4
D 261
R 169
O 5
M
C
R
E
Y
N
O
L
D
S
D 11
R 8
P 1
R 21
D 19
D 44
R 36
1939 William Bankhead (D-AL) B
U
T
L
E
R
Roosevelt/Garner - 67%
Landon/Knox - 32%
Other - 1%
1938 D 76
R 16
O 4
D 333
R 89
O 13
C
A
R
D
O
Z
O
B
R
A
N
D
E
I
S
Storke (D) D 13
R 4
P 1
Frank Merriam (R)
George Hatfield (R); 1935-39
R 25
D 15
D 47
R 33
1937 V
A
N

D
E
V
A
N
T
E
R
S
U
T
H
E
R
L
A
N
D
McAdoo (D)
1936 D 69
R 25
O 2
D 323
R 102
O 10
D 13
R 7
R 31
D 8
I 1
R 42
D 37
I 1
1935 Joseph Byrnes, Sr. (D-TN) Roosevelt/Garner - 58%
Hoover/Curtis - 37%
Other - 5%
1934 D 58
R 36
FL 1
Henry Rainey (D-IL) D 313
R 117
FL 5
D 11
R 9
R 35
D 5
R 55
D 25
1933 James Rolph (R)
Frank Merriam (R)
1932 James Watson (R-IN)
George H. Moses (R-NH)
R 48
D 47
FL 1
John N. Garner (D-TX) D 220
R 214
FL 1
Shortridge (R) R 10
D 1
R 36
D 4
R 73
D 7
1931 H
O
L
M
E
S
Hoover/Curtis - 65%
Smith/Robinson - 34%
Other - 1%
1930 R 54
D 41
FL 1
Nicholas Longworth (R-OH) R 270
D 164
FL 1
CC Young (R)
Herschel Carnahan (R); 1928-31
Buron Fitts; 1927-28
R 35
D 5
R 71
D 7
I 2
1929 T
A
F
T
S
A
N
F
O
R
D
1928 Charles Curtis (R-KS)
George H. Moses (R-NH); 1925-33
Albert Cummins (R-IA); 1919-25
R 48
D 47
FL 1
R 238
D 194
O 3
R 74
D 6
1927 Coolidge/Dawes - 57%
La Follette/Wheeler - 33%
Davis/Bryan - 8%
Other - 3%
1926 R 55
D 40
FL 1
R 248
D 183
O 4
R 9
D 2
Friend Richardson (R)
CC Young (R)
R 37
D 3
R 75
D 5
1925
1924 R 53
D 42
FL 1
Frederick Gillett (R-MA) R 225
D 207
O 3
M
C
K
E
N
N
A
R 36
D 3
I 1
R 76
D 4
1923 Henry Cabot Lodge (R-MA)
Albert Cummins (R-IA)
Coolidge/Dawes - 57%
La Follette/Wheeler - 33%
Davis/Bryan - 8%
Other - 3%
1922 R 59
D 37
R 301
D 132
O 2
D
A
Y
C
L
A
R
K
E
P
I
T
N
E
Y
William Stephens (R)
CC Young (R)
R 33
D 7
R 73
D 7
1921
1920 R 49
D 47
R 239
D 193
O 3
W
H
I
T
E
Phelan (D) R 32
D 7
I 1
R 70
D 10
1919 Wilson/Marshall - 47%
Hughes/Fairbanks - 46%
Other - 7%
1918 Hamilton Lewis (D-IL)
Willard Saulsbury (D-DE); 1916-19
James Clarke (D-AR); 1913-16
D 54
R 42
Champ Clark (D-MO) D 217
R 216
O 1
R 5
D 4
O 2
R 20
D 11
O 9
R 69
D 9
O 2
1917
1916 D 56
R 40
D 230
R 197
O 8
Works (R) R 5 D 3 O 3 Hiram Johnson (P)
William Stephens (R); 1916-17
John Eshleman (P); 1915-16
Albert Wallace (R); 1911-15
R 21
D 10
P 9
P/D 28/15
R 33
O 4
1915 L
A
M
A
R
H
U
G
H
E
S
Roosevelt/Johnson - 42%
Wilson/Marshall - 42%
Debs/Seidel - 12%
Other - 4%
R 4 D 3 O 4
1914 D 53
R 42
P 1
D 290
R 134
O 11
L
U
R
T
O
N
Perkins (R) R 7
D 3
I 1
R 30
D 10
R 54
D 25
S 1
1913
1912 Rotation (R/D), 1911-12 R 50
D 42
D 230
R 163
O 1
R 7
D 1
R 32
D 18
R 69
D 11
1911 William P. Frye (R-ME) H
A
R
L
A
N
Taft/Sherman - 55%
Bryan/Kern - 33%
Debs/Hanford - 7%
Other - 5%
1910 R 60
D 32
Joseph G. Cannon (R-IL) R 219
D 172
F
U
L
L
E
R
W
H
I
T
E
M
O
O
D
Y
B
R
E
W
E
R
Flint (R) R 8 Warren Porter (R)
James Gillett (R)
R 30
D 9
I 1
R 60
D 20
1909 P
E
C
K
H
A
M
1908 R 61
D 31
R 224
D 167
R 33
D 6
I 1
R 73
D 6
I 1
1907 Roosevelt/Fairbanks - 62%
Parker/Davis - 27%
Debs/Hanford - 9%
Other - 2%
1906 R 58
D 32
R 250
D 136
B
R
O
W
N
George Pardee (R)
Alden Anderson (R)
R 33
D 3
O 4
R 72
D 4
O 4
1905
1904 R 57
D 33
R 208
D 178
Bard (R) R 5
D 3
R 33
D 7
R 60
D 19
O 1
1903 McKinley/Roosevelt - 55%
Bryan/Stevenson - 41%
Other - 4%
1902 R 57
D 29
O 4
David Henderson (R-IA) R 198
D 152
PO 7
G
R
A
Y
S
H
I
R
A
S
R 7 Henry Gage (R)
Jacob Neff (R)
R 34
D 6
R 60
D 20
1901
1900 R 53
D 25
O 12
R 185
D 163
PO 9
R 26
D 14
R 59
D 20
I 2
1899 McKinley/Hobart - 49%
Bryan/Sewall - 48%
Other - 3%
White (D) R 6-1
1898 R 44
D 34
O 12
Thomas B. Reed (R-ME) R 203
D 127
PO 27
R 3
D 2
P 2
James Budd (D)
William Jeter (D); 1895-99
Spencer Millard (R); 1895
R 28
D 12
R 47
D 8
O 25
1897 F
I
E
L
D
1896 R 44
D 40
O 6
R 244
D 105
PO 8
R 4
D 2
R 25
D 15
R 64
D 14
O 2
1895 Cleveland/Stevenson - 44%
Harrison/Sewall - 44%
Weaver/Field - 9%
Other - 3%
1894 Isham G. Harris (D-TN)
Matt Ransom (D-NC), Jan. 1895
D 53
R 41
O 4
Charles Crisp (D-GA) D 217
R 127
PO 12
Henry Markham (R)
John Reddick (R)
R 22
D 18
D 45
R 31
O 2
1893 B
L
A
T
C
H
F
O
R
D
1892 Charles Manderson (R-NE) R 47
D 39
O 2
D 236
R 87
PO 9
L
A
M
A
R
Felton (R) Stanford (R) R 28
D 12
R 60
D 19
O 1
1891 B
R
A
D
L
E
Y
Harrison/Morton - 50%
Cleveland/Thurman - 47%
Other - 3%
1890 R 51
D 37
Thomas B. Reed (R-ME) R 164
D 160
M
I
L
L
E
R
Hearst (R) Robert Waterman (R)
Stephen M. White (D)
D 22
R 18
D 42
R 38
1889 John James Ingalls (R-KS) M
A
T
T
H
E
W
S
1888 R 39
D 37
John Carlisle (D-KY) D 168
R 153
O 4
R 41
D 39
1887 W
A
I
T
E
W
O
O
D
S
Blaine/Logan - 52%
Cleveland/Hendricks - 45%
Other - 3%
Williams (R) Washington Bartlett (D)
1886 R 42
D 34
D 181
R 142
O 2
Hearst (R) R 5
D 1
George Stoneman (D)
John Daggett (D)
D 20
R 20
R 60
D 20
1885 John Sherman (R-OH) Miller (R)
1884 George Edmunds (R-VT) R 48
D 36
O 2
D 195
R 121
O 10
Farley (D) D 6 D 32
R 8
D 61
R 19
1883 Hancock/English - 49%
Garfield/Arthur - 49%
Other - 2%
1882 D 37
R 37
O 2
Warren Keifer (R-OH) R 147
D 136
O 10
D 2
R 2
George C. Perkins (R)
John Mansfield (R)
R 23
D 7
O 10
R 44
D 33
O 5
1881 David Davis (I-IL) H
U
N
T
C
L
I
F
F
O
R
D
1880 Allen Thurman (D-OH) D 42
R 31
O 3
Samuel Randall (D-PA) D 149
R 131
O 13
S
T
R
O
N
G
S
W
A
Y
N
E
Booth (R) R 3
D 1
R46 D18 O16
1879 Hayes/Wheeler - 50%
Tilden/Hendricks - 49%
Other - 1%
William Irwin (D)
James Johnson (D)
D 27
R 10
O 3
D 55
R 24
O 1
1878 Thomas Ferry (R-MI) R 39
D 35
O 2
D 152
R 141
Sargent (R) R 2 D 2
1877 D
A
V
I
S
R 3 D 1 D 23
I 11
R 6
D 64
R 12
I 4
1876 R 45
D 30
O 1
D 178
R 110
I 4
D 3
R 1
1875 Michael Kerr (D-IN) Grant/Wilson - 56%
Greeley/Brown - 43%
Other - 1%
Romualdo Pacheco (R) D/I 14/8
R 18
I 34
R 27
D 19
1874 Matthew Carpenter (R-WI) R 52
D 20
LR 2
James Blaine (R-ME) R 199
D 89
LR 4
Hager (D) R 3
D 1
Newton Booth (R)
Romualdo Pacheco (R)
1873 C
H
A
S
E
Casserly (D) D 22
R 17
I 1
R 54
D 25
I 1
1872 Henry B. Anthony (R-RI) R 56
D 17
LR 1
R 137
D 103
LR 3
N
E
L
S
O
N
Cole (R) R 3
1871 Grant/Colfax - 51%
Seymour/Blair - 49%
Henry H. Haight (D)
William Holden (D)
D 26
R 12
I 2
D 67
R 10
I 3
1870 R 62
D 12
R 157
D 64
V 17
D 2
R 1
1869 G
R
I
E
R
R 21
D 19
D 52
R 28
1868 Benjamin Wade (R-OH) R 57
D 9
V 8
Theodore Pomeroy (R-NY) R 147
D 45
V 51
Conness (R)
1867 Schuyler Colfax (R-IN) W
A
Y
N
E
Lincoln/Johnson - 59%
McClellan/Pendleton - 41%
Frederick Low (R)
Tim Machin (D)
R 31
D 9
R 61
D 19
1866 Lafayette S. Foster (R-CT) R 41
D 13
V 20
R 135
D 54
V 55
McDougall (D) R 3
1865 C
A
T
R
O
N
R 35
D 5
R 70
D 10
1864 Daniel Clark (R-NH) R 33
D 17
V 22
D 96
R 89
V 56
T
A
N
E
Y
1863 Solomon Foot (R-VT) Lincoln/Hamlin - 32%
Douglas/Johnson - 32%
Breckinridge/Lane - 28%
Bell/Everett - 8%
Leland Stanford (R)
John Chellis (D)
R 31 D 9 R 63 D 17
1862 R 30
D 18
V 20
Galusha Grow (R-PA) R 109
D 71
V 59
Latham (D) D 23 R 17 D 41 R 39
1861 M
C
L
E
A
N
C
A
M
P
B
E
L
L
John G. Downey (D) D 30 R 6 D 60 R 19 O 1
1860 Benjamin Fitzpatrick (D-AL)
Jesse Bright (D-IN), June-July 1860
D 38
R 26
A 2
William Pennington (R-NJ) R 113
D 100
O 24
D
A
N
I
E
L
Gwin (D) D 2 Milton Latham (D) D 33 R 2 D 78 R 2
1859 Buchanan/Breckinridge - 48%
Fillmore/Jackson - 33%
Frémont/Dayton - 19%
Haun (D) John B. Weller (D)
Joseph Walkup (D)
D 30 R 4 I 1 D 72 R 8
1858 D 42
R 20
A 4
James L. Orr (D-SC) D 131
R 92
A 14
Broderick (D) D 27 R 5 A 3 D 66 R 9 O 5
1857 Thomas J. Rusk (D-TX) C
U
R
T
I
S
J. Neely Johnson (A)
Robert Anderson (A)
D 19 A 11 R 3 D 61 R 11 A 8
1856 Jesse Bright (D-IN) D 40
R/W 21
A 1
Nathaniel Banks (A-MA) O 100
D 83
A 51
Weller (D) A16 D16 W1 A 56 D 23 I 1
1855 Charles E. Stuart (D-MI) Pierce/King - 53%
Scott/Graham - 47%
Other - 0%
John Bigler (D)
Samuel Purdy (D)
D 26 W 7 D 42 W 36 I 2
1854 Lewis Cass (D-MI) D 39
W/FS 22
A 1
Linn Boyd (D-KY) D 158
W/FS 76
I 1
Gwin (D) D 26 W 8 D 68 W 12
1853 David R. Atchison (D-MO) D 20 W 7 D 41 W 22
1852 William R. King (D-AL) D 36
W 23
FS 3
D 130
W 86
O 17
M
C
K
I
N
L
E
Y
D 26 W 2 D 41 W 21 I 1
1851 W
O
O
D
B
U
R
Y
United States of America
State of California
Frémont (D) D 1
I 1
John McDougal (D) D 10 W 4 I 2 W 18 D 17 I 1
1850 D 36
W 24
FS 2
Howell Cobb (D-GA) D 114
W 107
O 11
Peter H. Burnett (D) I 16 I 36
1849 David R. Atchison (D-MO) Mexican Cession US Military Occupation
1846-1849
Bennet Riley Persifor F. Smith
1848 D 39
W 21
Robert C. Winthrop (W-MA) W 116
D 109
O 2
Richard B. Mason
1847 Stephen Kearney Robert Stockton
1846 D 31
W 24
FS 1
John W. Davis (D-IN) D 140
W 78
A 6
California Republic William B. Ide John Sloat
1845 Ambrose Sevier (D-AR) S
T
O
R
Y
Mexican Republic República Mexicana
1885-1846
José Joaquín de Herrera Pío Píco
1844 Willie P. Magnum (W-NC) W 27
D 24
O 1
John W. Jones (D-VA) D 148
W 73
O 1
T
H
O
M
P
S
O
N
B
A
L
D
W
I
N
Valentín Canalizo Manuel Micheltorena
1843 Antonio López de Santa Anna
1842 W 29
D 22
O 1
John White (W-KY) W 143
D 99
Nicolás Bravo Juan Bautista Alvarado
1841 Samuel Southard (W-NJ) B
A
R
B
O
U
R
Antonio López de Santa Anna
1840 William R. King (D-AL) D 29
W 23
Robert Hunter (W-VA) D 125
W 109
8
Anastasio Bustamante
1839 Antonio López de Santa Anna
1838 D 35
W 17
James K. Polk (D-TN) D 130
W 101
11
Anastasio Bustamante Carlos Antonio Carrillo
1837 Juan Bautista Alvarado
1836 31-19-2 D 141
NR 76
23
José Justo Corro Mariano Chico
1835 John Tyler (NR-VA) 24-22-2 M
A
R
S
H
A
L
L
D
U
V
A
L
L
United Mexican States Estados Unidos Mexicanos
1824-1835
Miguel Barragán José Figueroa
1834 George Poindexter (NR-MS) NR 26
D 20
O 2
John Bell (D-TN) D 145
NR 61
34
J
O
H
N
S
O
N
Antonio López de Santa Anna
1833 Hugh Lawson White (D-TN) Andrew Stevenson (JD-VA) Valentín Gómez Farías
1832 Littleton Tazewell (D-VA) D 24
NR 22
O 2
D 128
NR 65
20
Melchor Múzquiz José María Echeandía
1831 Samuel Smith (D-MD) Anastasio Bustamante Manuel Victoria
1830 D 26
NR 22
D 135
NR 73
5
José María Echeandía
1829 W
A
S
H
I
N
G
T
O
N
Vicente Guerrero
1828 JD 27
AD 20
JD 113
AD 100
5
Guadalupe Victoria
1827
1826 Nathaniel Macon (D-NC) JD 26
AD 22
John Taylor (AD-NY) AD 107
JD 106
1825 John Gaillard (D-SC) T
O
D
D
1824 D 43
F 5
Henry Clay (D-KY) D 189
F 24
Provisional Government Luis Antonio Argüello
1823 L
I
V
I
N
G
S
T
O
N
Mexican Empire Imperio Mexicano
1521-1821
HM Agustín I
1822 D 44
F 4
Philip P. Barbour (D-VA) D 157
F 32
1821 Viceroyalty of New Spain Virreinato de Nueva España
1521-1821
HM Fernando VII Pablo Vicente de Solá
1820 D 38
F 8
John Taylor (D-NY) D 156
F 29
1819 James Barbour (D-VA) Henry Clay (D-KY)
1818 John Gaillard (D-SC) D 27
F 13
D 145
F 40
1817
1816 D 25
F 13
D 119
F 63
1815
1814 D 26
F 10
Langdon Cheves (D-SC) D 113
F 69
José Darío Argüello
1813 Joseph Varnum (D-MA) Henry Clay (D-KY) HM José I José Joaquín de Arrillaga
1812 William H. Crawford (D-GA) D 29
F 7
D 106
F 36
1811 John Pope (D-KY) C
H
A
S
E
1810 John Gaillard (D-SC) D 26
F 8
Joseph B. Varnum (D-MA) D 93
F 49
C
U
S
H
I
N
G
1809 Andrew Gregg (D-PA)
1808 Stephen Bradley (D-VT) D 28
F 6
D 115
F 27
HM Fernando VII
1807 HM Carlos IV
1806 Samuel Smith (D-MD) D 27
F 7
Nathaniel Macon (D-NC) D 114
F 28
P
A
T
E
R
S
O
N
1805 Joseph Anderson (D-TN)
1804 Jesse Franklin (D-NC) D 25
F 9
D 102
F 40
1803 John Brown (D-KY) M
O
O
R
E
1802 Stephen Bradley (D-VT) 17-15 D 68
F 38
1801 Abraham Baldwin (D-GA) 18-14
1800 John E. Howard (F-MD) F 21
D 11
Theodore Sedgwick (F-MA) F 60
D 46
E
L
L
S
W
O
R
T
H
Pedro de Alberni
1799 James Ross (F-PA) I
R
E
D
E
L
L
Diego de Borica
1798 Theodore Sedgwick (F-MA) F 22
D 10
Jonathan Dayton (F-NJ) F 56
D 50
W
I
L
S
O
N
1797 William Bradford (F-RI)
1796 Samuel Livermore (F-NH) F 21
D 11
D 59
F 47
1795 Henry Tazewell (D-VA) B
L
A
I
R
1794 Ralph Izard (PA-SC) PA 16
AA 14
Frederick Muhlenberg (AA-PA) AA 55
PA 50
J
A
Y
1793 John Langdon (PA-NH) José Joaquín de Arrillaga
1792 PA 17
AA 13
Jonathan Trumbull, Jr. (PA-PA) PA 39
AA 30
José Antonio Roméu
1791 Richard Henry Lee (AA-VA)
1790 John Langdon (PA-NH) 18-8 Frederick Muhlenberg (PA-PA) 37-28 Pedro Fages
1789 Cyrus Griffin (VA)
1788 Congress of the Confederation
1781-1789
HM Carlos III
1787 Arthur St. Clair (PA)
1786 Nathaniel Gorham (MA); from June 6, 1786 • John Hancock (MA); until June 5, 1786
1785 Richard Henry Lee (VA)
1784 Thomas Mifflin (PA)
1783 Elias Boudinot (NJ)
1782 John Hanson (MD) Felipe de Neve
1781 Thomas McKean (DE)
1780 Continental Congress
1774-1781
Samuel Huntington (CT)
1779 John Jay (NY)
1778 Henry Laurens (SC)
1777 John Hancock (MA) Fernando Rivera y Moncada
1776
1775 Peyton Randolph (VA)
1774 Henry Middleton (SC) Pedro Fages
1773 Thirteen Colonies
1607–1776
HM George III Frederick North, Lord North (Tory)
1772
1771
1770 Gaspar de Portolá
1769 Augustus FitzRoy, 3rd Duke of Grafton (Whig)
1768 William Pitt, 1st Earl of Chatham (Whig)
1767
1766 Charles Watson-Wentworth, 2nd Marquess of Rockingham (Whig) Spanish Viceroys:
Carlos Francisco de Croix  1766-1771
Joaquín de Montserrat  1760-1766
Francisco Cajigal de la Vega  1760
Agustín de Ahumada y Villalón  1755-1760
Juan Francisco de Güemes y Horcasitas  1746-1755
Pedro Cebrián y Agustín  1742-1746
Pedro Malo de Villavicencio  1741-1742
Pedro de Castro Figueroa y Salazar  1740-1741
Juan de Acuña y Bejarano  1722-1734
Baltasar de Zúñiga Guzmán Sotomayor  1716-1722
Fernando de Alencastre Noroña y Silva  1710-1716
Francisco V Fernández de la Cueva Enríquez  1702-1710
Juan de Ortega Cano Montañez y Patiño  1701-1702
José Sarmiento Valladares Arines de Romay  1696-1701
Juan de Ortega Cano Montañez y Patiño  1696
Gaspar Melchor Baltasar  1688-1696
Melchor Portocarrero y Lasso de la Vega  1686-1688
Tomás Antonio Manuel Lorenzo de la Cerda  1680-1686
Payo Enríquez de Rivera Manrique  1673-1680
Pedro Nuño Colón de Portugal y Castro  1673
Antonio Sebastián de Toledo Molina  1664-1673
Diego Osorio de Escobar y Llamas  1664
Juan de Leyva de la Cerda  1660-1664
Francisco Fernández de la Cueva  1653-1660
Luis Enríquez de Guzmán  1650-1653
Marcos de Torres y Rueda  1648-1649
García Sarmiento de Sotomayor  1642-1648
Juan de Palafox y Mendoza  1642
Diego Roque López Pacheco Cabrera  1640-1642
Lope Díez de Aux de Armendáriz  1635-1640
Rodrigo Pacheco y Osorio de Toledo  1624-1635
Diego Carrillo de Mendoza y Pimentel  1621-1624
Diego Fernández de Córdoba  1612-1621
García Guerra  1611-1612
Luís de Velasco  1607-1611
Juan de Mendoza y Luna  1603-1607
Gaspar de Zúñiga Acevedo y Fonseca  1595-1603
Luís de Velasco  1590-1595
Álvaro Manrique de Zúñiga  1585-1590
Pedro de Moya y Contrerás  1584-1585
Lorenzo Suárez de Mendoza  1580-1583
Martín Enríquez de Almanza  1568-1580
Gastón Carrillo de Peralta y Bosquete  1566-1567
Luís de Velasco  1550-1564
Antonio de Mendoza  1535-1550
1765
1764 George Grenville (Whig)
1763
1762 John Stuart, 3rd Earl of Bute (Tory)
1761 Thomas Pelham-Holles, 1st Duke of Newcastle
1760
Before 1760 British Monarchs:

HM George II  1727-1760

HM George I  1714-1727

HM Anne  1702-1714

HM William III  1689-1702

HM Mary II  1689-1694

HM James II  1685-1688

HM Charles II  1660-1685


British Lord Protectors:

Richard Cromwell  1658-1659

Oliver Cromwell  1653-1658


British Monarchs:

HM Charles I  1625-1649

HM James I  1603-1625
British Prime Ministers:

Thomas Pelham-Holles (Whig)  1757-1762

William Cavendish (Whig)  1756-1757

Thomas Pelham-Holles (Whig)  1754-1756

Henry Pelham (Whig)  1743-1754

Spencer Compton (Whig)  1742-1743

Robert Walpole (Whig)  1721-1742
Before 1760 Spanish Monarchs:

HM Fernando VI  1746-1759

HM Felipe V  1724-1746

HM Luis I  1724

HM Felipe V  1700-1724

HM Carlos II  1665-1700

HM Felipe IV  1621-1665

HM Felipe III  1598-1621

HM Felipe II  1556-1598

HIM Carlos I  1516-1556
NOTE: After 1921, the de facto leader of Senate became the Majority Leader, as such, that individual is listed with the de jure leader, the President Pro Tempore, in smaller text. From 1913-1920, the Democratic Leader listed was officially the Democratic Whip. Before 1913, the de jure and de facto elected leader in the US Senate was the President Pro Tempore. After the adoption of the Constitution, the Congress was split into two chamber (House & Senate), under the Articles of Confederation (1781-1789) and statutory convention (1776-1781), there was a President of the (Continental/Confederation) Congress that served as leader of the legislature.

KEY
Modern Political Affiliations:
D - Democratic Party (1828-)   Jacksonian Party (1825-1828); Democratic-Republican Party (1796-1825)
R - Republican Party (1854-)   National Union Party (1864)
I - Independent (Unaffiliated)
O - Other   Usually a combination of independents and/or smaller parties other than the two main parties

Historical Political Affiliations and Third Parties:
A - American Party (1844-1860)   Also known as the Know Nothing Party
AA - Anti-Administration Faction (1789-1796)   Evolved into the Democratic-Republican Party
AD - Anti-Jacksonian Faction of the Democratic-Republican Party (1824-1828)   Evolved into the National Republican Party
FL - Farmer-Labor Party (1918-1936)   Most merged into the Democratic Party
F - Federalist Party (1789-1824)   Dissolved with most former members creating the National Republican Party
FS - Free Soil Party (1848-1854)   Split from the Whig Party; Liberty Party (1840-1848)
JD - Jacksonian Faction of the Democratic-Republican Party (1824-1828)   Took control of the Democratic-Republican Party
LR - Liberal Republican Party (1870-1872)   Split from the Republican Party and members dispersed back into the Democratic and Republican Parties
NR - National Republican Party (1824-1834)   Evolved into the Whig Party
PO - Populist Party (1892-1909)   Dissolved and members dispersed back into the Democratic and Republican Parties
P - Progressive Party (1912-1916, 1924-1946)   Wisconsin Progressive Party (1934-1946); Originally split from the Republican Party
PRO - Prohibition Party (1869-)
PA - Pro-Administration Faction (1789-1794)   Most merged into the Federalist Party
S - Socialist Party (1901-1972)
V - Vacancy due to the Civil War & Reconstruction (1860-1868)
W - Whig Party (1833-1856)   Most merged into the Republican Party