The party that was against slavery supported Free- Soil Party.
Step-by-step explanation:
The Free- Soil party was formed in the year 1848 in the month of August. The main motto of Free -Soil party was free speech, free men and lastly free labor. Free Soilers were against slavery. They said it was impossible for government to remove slavery but if they try they will be able to restrict it. Free Soil party survived for two presidential elections.
Free Soil Party was one of the factor for which Civil War was caused, the party said southerns that northerners practiced slavery. Free Soil Party was an unsuccessful party as the party received very less vote that is 5%.