Answer:
Expansion lead the economic promises and fueled the manifest destiny but it also led to sectional tension over slavery. The north contained a lot of abolitionists while the south was commonly pro-slavery, this increased sectional tension because each side wanted to see their ideals extended into the west.
The correct answer should be by creating a labor shortage that pushed the continent toward a market economy
People started earning a lot more because the competition was reduced and people started to pay more to get things. Peasants started earning more and the economy started growing since there was now fewer people. People who were skilled at things were now a minority.
