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The Louisiana Purchase doubled the size of the US when Thomas Jefferson bought it from Napolean.
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On this day President Madison signed a declaration of war against Britain.
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On this day both Mexico and America sent troops to Texas to try and claim land and the war had begun.
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This is the day when the Gold Rush began because James Marshall discovered a few flecks of gold at Sutter's Mill in California.
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On this day the Treaty of Guadelupe Hidalgo was signed ending the war in America's favor.