The migration patterns of a group of people, the way those people affect their land, and the way their land affects those people
I think the answer would be A which would be that it required all citizens to support the slave system.
Trade unions in 1914. Hope that's what you were looking for :)
They would need California, Texas, New York, Florida, Pennsylvania, Illinois, Ohio, Michigan, Georgia, North Carolina, and New Jersey. So 11, but it's basically impossible.
