Prior to the Civil War, how was the issue of slavery related to westward expansion?
A)The large number of plantation-style farms in western territories made it likely that slavery would expand westward
B) The possible addition of new states created from western lands raised concerns over the balance between free and slave states.
C) The westward expansion into lands formerly controlled by Spain helped create a Hispanic labor market to replace the use of slave labor.
D) The discovery of gold western territories led to a large increase in the use of slave labor in gold mines.