The answer to this is..
Plenty of labor was available from immigrants.
Industry grew, particularly in coal and steel.
There was trade going on with European nations.
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Never before in human history had so many of the world's plants, animals, and microorganisms been so thoroughly and so abruptly mixed and dispersed. We call this phenomenon the Columbian Exchange. Determined to farm the American land in a European manner, the colonists introduced their livestock: pigs, horses, mules, sheep, and cattle.
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The lack of political focus during reconstruction was the great economic prosperity in the north following the Civil War... That fail of the north to effectively rebuild the south and bring it back into Union during the reconstruction is evident after time period.
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Roe vs Wade
it was about fighting to keep abortion legal, claiming it should be a choice
The phenomenon that triangular trade most directly encouraged was slavery. The first part of the triangle was the crossing of the Atlantic Ocean by Europeans wishing to sell their products. With the money obtained the europeans would buy slaves; sometimes they would just trade the products they brought directly for slaves. The same european ships would then sail to America to sell the slaves as plantation labourers. With the money obtained the europeans bought raw products like cotton and took them to Europe for further processing. The complete cycle took like a year.