Which of the following best describes the difference between the Democratic and Republican parties during the 1800s?

A
Democrats were mostly anti-slavery while Republicans were pro-slavery.

B
Democrats were pro-slavery while Republicans were mostly anti-slavery.

C
Democrats were popular in the North and Republicans were popular in the South.

D
Democrats wanted to have Senate races while Republicans wanted to cancel them.

B

Democrats were pro-slavery while Republicans were mostly anti-slavery.