The importance of the presidency causes diverse groups across the nation to coalesce into the
same two parties within each state. This helps explain the organizational reasons for the two-party
system in American politics, the physiological reasons for the two-party system in American politics,
psychological reasons for the two-party system in American politics, and the structural reasons
for the two-party system in American politics.

Which group of American voters has experienced the greatest change in party attachment since the civil
rights period (1960s)?
- Jews in the Midwest
- Black northerners
- White southerners
- Latino women in the Great Lakes region