What did the Free Soil Party lobby for? A. ban of slavery in Southern states B. ban of slavery in US territories from Mexico C. more land from Britain near Canada D. more land from France near Louisiana E. more land in from Mexico

B: proposed law that would have banned slavery in any territory acquired from Mexico in the Mexican-American War

The party originated in New York after the state Democratic convention refused to endorse the Wilmot Proviso, a proposed law that would have banned slavery in any territory acquired from Mexico in the Mexican-American War. A faction of New York Democrats known as the Barnburners objected to slavery in the territories and opposed the 1848 Democratic nominee Lewis Cass. The Barnburners and other anti-slavery Democrats joined with some anti-slavery Whigs and the Liberty Party to form the Free Soil Party.