Uncle Tom's Cabin was a novel written by Harriet Beecher Stowe about slavery in the south. When people read it, they started to realize and be informed about what slavery was like, so more people started being opposed to slavery (because before this, people in the north tended to not care) and more people became abolitionists.
Slaves from africa where brought to the americas to mine and work in farms
Answer: Before permanently settling the western territories, the United States had to consider the presence of Native Americans already living on these lands. Great Britain may have agreed to give the United States the land, but no one had consulted with the Indian people concerning this change. Reacting to the pressure of American settlers anxious for new land, Congress sought treaties with Native Americans to insure the safety of the settlers, and to obtain clear title for the land.
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women joined the workforce
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While WWI was fought in the trenches and used machine guns and poisonous gas, WWII was fought using modern artillery and machines utilizing more airplanes, ships, tanks, and submarines. Special operations methods were also developed during this war together with atomic missiles and secret communications.