Final answer:
Before 1960, the Republican Party supported the end of segregation and promoting social equality among races, while the Dixiecrat Party, which split from the Democratic Party, opposed civil rights for African Americans and resisted federal government intervention in ending segregation.
Step-by-step explanation:
The Republican Party before 1960 can be matched with the description of supporting the end of segregation, extending voting rights, and promoting social equality among races. This is because the Republicans were the dominant party in national politics due to their opposition to the expansion of slavery and their role in stabilizing the Union during Reconstruction. The Democratic Party before 1960 can be matched with the description of being split into the Dixiecrat Party, also known as States' Rights Democrats, who opposed civil rights for African Americans and resisted federal government intervention in ending segregation. The Dixiecrats threatened Democratic unity and remained significant in the 1950s and 1960s. The Dixiecrat Party vanished over time and its members either returned to the Democratic Party or joined other parties.