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Slavery ended in  1863.

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The only way they could hope to keep abreast with the northwestern states expansion of the free states was to make Texas apart of the U.S.

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The constitution gave slave holders the right to recover slaves if they excaped to the northern state.

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While the South stayed with large Plantation-type agriculture, the North Industrialized and expanded quickly.

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In 1819, 11 states were slave states and 11 committed to freedom.

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The Introduction of cotton was invented  by Eli Whitney in 1793. The South started the production of cotton, and required even more slaves.

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The U.S constitution prohibited slave trade after January 1, 1808, and slavery began to die out in the north and to dwindle slowly in the South.

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Slavery had existed in The American Colonies since the first blacks were brought to Virgina in 1619