Polarization contribution

Eisenhower won 41 of 48 states in 1956 with substantial Democratic crossover support; era of low partisan polarization.

Kennedy averaged ~70% Gallup approval through term; generally unifying figure despite civil rights tensions.

FDR's 1936 'I welcome their hatred' speech against organized money was polarizing rhetorically but his governing coalition was the broadest in 20th-century US politics.

Religious Right (Moral Majority) emerged during Carter term opposing his policies despite Carter's own evangelical faith — initiating subsequent four decades of religion-politics realignment.

Ford lost 1976 election narrowly (50.1% to 48.0%); election was competitive across both ideological spectrum and regions, suggesting modest polarization.

Bush 1988 campaign Willie Horton advertising became defining example of racially charged political messaging; Bush's personal civility contrasted with campaign strategy.

Biden 'Soul of the Nation' framing was substantively pro-democracy but contributed to partisan polarization; achieved some bipartisan legislation (Infrastructure, CHIPS, Respect for Marriage, ECA reform).

Truman publicly denounced McCarthy by name from 1950 onward but his own loyalty program had legitimized the political category of 'communist sympathizer' as basis for federal action.

Reagan-era political realignment and the simultaneous Fairness Doctrine repeal seeded the late-20th-century polarized media-political environment.

Wallace's 1968 third-party candidacy won 13% of vote, signaling Southern Democratic break from national party that accelerated under Nixon's Southern Strategy.

1994 Republican Revolution under Gingrich shifted Congress to highly polarized confrontation with Clinton administration; era of intensified partisan polarization.

Partisan polarization measured by Pew reached then-record highs during Obama term; Tea Party movement and Trump-driven birtherism contributed to subsequent Republican Party transformation.

Nixon's Southern Strategy and Silent Majority framing systematically realigned US partisan politics around racial and cultural lines, with long-lasting polarization effects.

Partisan polarization measured by Pew increased substantially during GW Bush term; Iraq War assessments split along partisan lines unprecedented in foreign-policy polling history.

Trump T2 continuing peak-polarization rhetoric from T1; 'enemy from within' framing, judiciary attacks pattern.

Partisan polarization measured by Pew reached historic highs during Trump T1; partisan-feeling-thermometer gap widest measured to that point.