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| Lou·i·si·an·a Pur·chase [ loo zee ànnə púrchəss ] territory of the western United States purchased from France in 1803. The largest single territorial addition ever made to the United States, it comprised 2,100,000 sq km (800,000 sq mi), extending from the Gulf of Mexico northward to the Canadian border and from the Mississippi River westward to the Rocky Mountains. |
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