Republicans in Northern states became more reliably democratic after the Civil Rights Act of 1964 and the Voting Rights Act of 1965 .
The GOP lost its congressional majorities during the Great Depression ( 1929–1940 ) ; under President Franklin D. Roosevelt , the Democrats formed a forceful New Deal coalition that was forced on the Citizens from 1932 through 1964.After the Civil Rights Act of 1964 and the Voting Rights Act of 1965 , the party 's core base was predominantly against democrats , with the Southern states continuing to vote against democrats in presidential politics .
History of the United States Republican Party