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The Midwest was part of the Louisiana Territory purchased from France. Mexico refused to sell the American Southwest, but the US forced them to sell after a three-year war. The Oregon Territory (Oregon and Washington state) were disputed and jointly administered by the US and Great Britain, but after negotiation the British and the US split Oregon Territory in approximately in half along the 49th parallel, most of the modern day border between the US and Canada.

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14y ago

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