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  This event involved America's purchase of the Louisiana Territory from France.
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  Lewis and Clarke were the first american explorers to cross the western portion of the U.S.
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  It didn't take long after gold was discovered in California for hundreds of people to pack up their lives and move all they had to California in search of fast wealth.
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  The war between the northern U.S. states and the southern U.S. states over the issues of political power and slavery.
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