White landowners who could make those African Americans work for them
I think the answer would be the Compromise of 1850 that led to sectional tensions and the formation of a new political party. It was a package of five separate bills passed by the United States Congress in September 1850, which defused a four-year political confrontation between slave and free states regarding the status of territories acquired.
They created more jobs to better the economy. These jobs mostly in manufacturing as that would be best for the war effort.
