The main reason for both the wars is that the United States did not want Communism to spread in Southeast Asia (also the world). The Domino Theory states that if one country were to become communist, then other countries would follow until there were communist countries everywhere. The US was simply trying to protect their own interests.
The party argued that free men on free soil was a morally and economically superior system to slavery. The party agreed with the Wilmot Proviso, and tried to remove existing laws that discriminated against freed African Americans. The party was active from 1848 to 1852.
