What was the last year the United States didn't alternate between parties for the presidential election?
1988
1988
1988
1988
2016
1988
2016
1988
2016
1976
1988
2016
1992
1976
1988
2016
1992
1976
1988
2020
2016
1992
1976
2008
1980
1988
1984
2020
2016
1992
2000
1976
1972
2008
1980
1988
1984
2004
2020
2016
1992
2000
1976
1996
1972
2008
1980
1988
1984
2004
1968
2020
2016
1992
2000
1976
1996
1972
2008
1980
1988
1984
2004
1968
2020
2016
1992
2000
1976
1996
1972
2008
1980
1988
1984
2004
1968
2020
2016
1992
2000
1976
1996
1972
2008
1980
1988
1984
2004
1968
2020
2016
1992
2000
1976
1996
1972
2008
1980
1988
1984
2004
1968
2020
2016
1992
2000
2012
1976
1996
1972
2008
1980
1988
1984
2004
1968
2020
2016
1964
1992
2000
2012
1976
1996
1972
2008
1980
1988
1984
2004
1968
2020
2016
1964
1992
2000
2012
1976
1996
1972
2008
1980
1960
1988
1984
2004
1968
2020
2016
1964
1992
2000
2012
1976
1996
1972
2008
1980
1960
1988
1984
2004
1968
2020
2016
1964
1992
2000
2012
1976
1996
1972
2008
1980
1960
1988
1984
2004
1968
2020
2016
1964
1992
2000
2012
1976
1996
1988.
2020.
1992.
1976.
1988.
1988.
2020.
1988.
2020.
1988.
2020.
1988.
2020 election