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.
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The caste system was the dominant social system of "India," since it had pre-modern roots in this area and helped build a system of social stratification, which was altered by British rule.
