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President Thomas Jefferson sends James Monroe to purchase almost a million square miles from France, effectively doubling the size of the United States at the time.
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Alabama, the 22nd state enters the Union, bringing both the total number of slave states and free states to 11.
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Francis Guy
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The Mexican-American War end with the treaty of Guadalupe Hidalgo. From the treaty, the US gains much of the current Southwest.
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The last spike of the first Transcontinental Railroad is driven in Promontory Summit, UT.
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