4. How did Manifest Destiny increase tension between the free Northern states and the Southern slave states?

Expansion leads to economic promise and fueled the manifest destiny but it also lead 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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following type of cultural development caused people to want and buy new products on the market :

islam spread slowly through much of africa through trade and preaching.