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Postscript: Lists of leaders
Cross-posting from the Alternate Presidents & PMs thread:

Presidents of the United States
1965-1969: Lyndon Johnson / Hubert Humphrey (Democratic)
1964: Barry Goldwater/William E. Miller (Republican)
1969-1975: Hubert Humphrey‡ / Edmund Muskie (Democratic)
1968: Richard Nixon/Spiro Agnew (Republican), George Wallace/Curtis LeMay (American Independent)
1972: Ronald Reagan/Rogers Morton (Republican)

1975-1976: Edmund Muskie (Democratic) / (vacant)
1976-1977: Edmund Muskie / Robert Byrd (Democratic)
1977-1985: George Bush / Bob Dole (Republican)

1976: Edmund Muskie/Robert Byrd (Democratic)
1980: George McGovern/Reubin Askew (Democratic)

1985-1989: Bob Dole / John Heinz (Republican)
1984: John Glenn/Lloyd Bentsen (Democratic)
1989-1997: Walter D. Huddleston / Jim Blanchard (Democratic)
1988: Bob Dole/John Heinz (Republican)
1992: Phil Crane/Thad Cochran (Republican), Lowell Weicker/John B. Anderson (independent)

1997-2001: Pete Wilson / Lamar Alexander (Republican)
1996: Jim Blanchard/Barbara Boxer (Democratic), Fob James/Bob Dornan (Values)
2001-2005: Dick Gephardt / Ron Brown (Democratic)
2000: Pete Wilson / Lamar Alexander (Republican)
2005-2009: Dick Gephardt / Jim Hunt (Democratic)
2004: Elizabeth Dole/Larry Pressler (Republican)
2009-2017: Bob Riley / Michael Castle (Republican)
2008: Al Gore/Joseph P. Kennedy II (Democratic)
2012: Andrew Cuomo/Mark Warner (Democratic), Paul Wellstone/Rocky Anderson (Green)

2017-XXXX: Deval Patrick / Joe Sestak (Democratic)
2016: Bill Haslam/Tim Pawlenty (Republican)

General Secretaries of the Soviet Union
1964-1982: Leonid Brezhnev (Communist)‡
1982-1984: Yuri Andropov (Communist)‡
1984-1992: Viktor Grishin (Communist)‡
1992-1999: Mikhail Gorbachev (Communist)
1999-XXXX: Alexander Rutskoy (Communist)


Prime Ministers of the United Kingdom
1964-1973: Harold Wilson (Labour)
1964: Sir Alec Douglas-Home (Conservative), Jo Grimond (Liberal)
1966: Edward Heath (Conservative), Jo Grimond (Liberal)
1970: Edward Heath (Conservative), Jeremy Thorpe (Liberal)

1973-1975: James Callaghan (Labour)
1975-1986: William Whitelaw (Conservative)

1975: James Callaghan (Labour)
1979: Michael Foot (Labour), David Steel (Democratic)
1980: Michael Foot (Labour), David Steel (Democratic)
1984: Michael Foot (Labour), David Steel (Democratic)

1986-1991: Michael Heseltine (Conservative)
1989: Neil Kinnock (Labour), David Penhaligon (Democratic)
1991-2000: Neil Kinnock (Labour)
1991: Michael Heseltine (Conservative), David Penhaligon (Democratic)
1995: Norman Lamont (Conservative), David Penhaligon (Democratic)
1999: Michael Portillo (Conservative), Charles Kennedy (Democratic)

2000-2006: Gordon Brown (Labour)
2001: Michael Heseltine (Conservative), Charles Kennedy (Democratic)
2006-2015: William Hague (Conservative)
2006: Gordon Brown (Labour), Malcolm Bruce (Democratic)
2010: Jon Cruddas (Labour), Malcolm Bruce (Democratic)
2014: Jim Murphy (Labour), Simon Hughes (Democratic)

2015-XXXX: Jim Murphy (Labour)
2015: William Hague (Conservative), Simon Hughes (Democratic)

Prime Ministers of Canada
1968-1979: Pierre Trudeau (Liberal)

1968: Robert Stanfield (Progressive Conservative), Tommy Douglas (New Democratic), Réal Caouette (Social Credit)
1972: Robert Stanfield (Progressive Conservative), David Lewis (New Democratic), Réal Caouette (Social Credit)
1974: Robert Stanfield (Progressive Conservative), David Lewis (New Democratic), Réal Caouette (Social Credit)

1979-1984: Jack Horner (Progressive Conservative)
1979: Pierre Trudeau (Liberal),Ed Broadbent (New Democratic), Fabien Roy (Social Credit)
1984: Allan MacEachan (Liberal), Ed Broadbent (New Democratic)

1984-1990: Allan MacEachan (Liberal)
1984: Jack Horner (Progressive Conservative), Ed Broadbent (New Democratic)
1988: John Crosbie (Progressive Conservative), Ed Broadbent (New Democratic)

1990-1996: John Crosbie (Progressive Conservative)
1990: Allan MacEachan (Liberal), Dave Barrett (New Democratic), Preston Manning (Reform)
1994: Jean Chrétien (Liberal), Dave Barrett (New Democratic), Preston Manning (Reform), Jacques Parizeau (Union du Québéc)

1996-2001: Perrin Beatty (Progressive Conservative)
1996: Jean Chrétien (Liberal), Dave Barrett (New Democratic), Preston Manning (Reform), Jacques Parizeau (Union du Québéc)
2001-2011: John Manley (Liberal)
2001: Perrin Beatty (Progressive Conservative), Lorne Nystrom (New Democratic), Bernard Landry (Union du Québéc)
2005: Mike Harris (Progressive Conservative), Pauline Marois (Union du Québéc), Lorne Nystrom (New Democratic)
2009: Mike Harris (Progressive Conservative), Pauline Marois (Union du Québéc), Lorne Calvert (New Democratic), Adriane Carr (Green)

2011-XXXX: Thomas Mulcair (Liberal)
2013: Brian Pallister (Progressive Conservative), Lorne Calvert (New Democratic), Adriane Carr (Green), Pauline Marois (Union du Québéc)

Popes of the Roman Catholic Church
1963-1978: Paul VI (Giovanni Battista Montini) (Liberal)
1978-1993: Pius XIII (Sebastiano Baggio) (Moderate)
1993-2011: Benedict XVI (Joseph Ratzinger) (Conservative)
2011-XXX: Leo XIV (Odilo Scherer) (Conservative)


Presidents of Mexico
1994-2000: Luis Donald Colosio (PRI)
1994: Diego Fernández de Cevallos (PAN), Cuahtémoc Cardenas (PRD)
2000-2006: Vincente Fox (PAN)
2000: Emilio Chuayffet (PRI), Cuahtémoc Cardenas (PRD)
2006-2012: Santiago Creel (PAN)
2006: Andrés Manuel López Obrador (PRD), Beatriz Paredes (PRI)
2012-XXXX: Marcelo Ebrard (PRD)
2012: Manlio Fabio Beltrones (PRI), Ernesto Cordero (PAN)

Presidents of France
1959-1969: Charles de Gaulle (UNR)*
1958: Georges Marrane (Communist)
1965: François Mitterand (PS)

1969: Alain Pohler (Democratic Centre) (acting)
1969-1974: Georges Pompidou (UDR)‡
1969
: Alain Pohler (Democratic Centre)
1974: Alain Pohler (Democratic Centre) (acting)
1974-1981: Valéry Giscard d'Estaing (Independent Republican/UDF)
1974: François Mitterand (PS)
1981-1995: François Mitterand (PS)
1981: Valéry Giscard d'Estaing (UDF)
1988: Jacques Chirac (RPR)

1995-2002: Lionel Jospin (PS)
1995: Édouard Balladur (RPR)
2002-2016: Alain Juppé (RPR)
2002: Lionel Jospin (PS)
2009: Laurent Fabius (PS)

2016-XXXX: Christine Lallouette (RPR)
2016: Arnaud Montebourg (PS)

‡- died of natural causes; coalition partner; *-resigned

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