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Slavery in the United States existed from the early years of the colonial period; it was firmly established by the time the United States sought independence from Great Britain in 1776. However, by 1804, all states north of the Mason and Dixon Line had either abolished slavery outright or passed laws for the gradual abolition of slavery. In 1787 Congress prohibited slavery in the Northwest Territory. But slavery gained new life in the South with the cotton industry after 1800, and expanded into the Southwest. The nation was polarized into slave and free states along the Mason-Dixon Line, which separated Pennsylvania and Maryland.
Read more :http://en.wikipedia.org/wiki/Slavery_in_the_United_States
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