In america, early industrialization, westward expansion, and the growing sectional tension all occurred at the same time. how was the development of the economy before the civil war related to both the westward movement and the increasing sectional conflict

The more of the new Western territories that linked the USA as free soil, the additional power the North would delight in Congress, which would then permit more laws that favored Northern welfares. This mostly concerned the tariffs on trade in goods - efficiently a tax on the South, which had no industrial capability and be contingent heavily on imports. But there was also the aggregate power of the Abolitionist lobby, which not only conflicting the extension of slavery, but required to ban slavery in its traditional cores too. People moving west gave the people who remained in the East fewer to work with. Also, the battle between the north and south made it tougher to trade or do commercial between groups of the country. 

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explanation:

the phenomenon that would be cited as evidence of increased economic interdependence between europe and the americas is  the development of mercantilism.

this theory suggests that the wealth of a country depends on its economic assets, or capital.

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