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The cotton gin was an invention that helped to clean cotton faster, reducing the time to clean it by hours.
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This was a time when America bought 827,000 miles of land from France.
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In order to keep power balanced, Missouri was to be a slave state, and Maine a free one.
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The nullification crisis was a feud between President Andrew Jackson, and South Carolina.
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There was gold discovered in California, and many people moved there.
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The book told the events and treatment of slavery, and told people how they were really treated.
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This was a time when Kansas was fought over whether to be a slave or free state.
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Although Dred Scott lived in free territory, the court said that he was still to be a slave.
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Abraham Lincoln, a abolitionist, was elected and decided to get rid of slavery.
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Shots were fired at the fort, leading to the start of the civil war.