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Eli Whitney created cotton gin
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A slave could sell for $600.
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Federal law abolished oversea slave trade. Interstate trade soon filled the gap.
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The total number of slaves increased from 1.5 million to 4 million.
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Lowell Mill girls held strikes when employers cut their wages & increased their charges for boarding.
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A court in New York convicts 20 tailors of conspiracy for forming a union.
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Southern plantations produced 60% of the cotton used by American & European factories.
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Immigration came mostly from England and Scottland.
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A slave could sell for triple the price of before ($1800).