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April 30, 1803 France's claim to the territory of Louisiana.
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U.S. fishermen along Newfoundland and Labrador, provided for joint control of Oregon territory, and marked the beginning of better relations between Britain and the U.S.
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The Adams-Onís Treaty between the United States and Spain was negotiated by Secretary of State John Quincy Adams and the Spanish Minister to the United
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The Spanish were the first to colonize the states that today make up the American southwest, including the state of Texas.
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In 1846 a war erupted between Mexico and the United States, prompted by of the confusion over the title of various lands in the Mexican Cession
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August 14, 1848 The lead case for the Louisiana Purchase States government of the territory on the northwest coast of America
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December 30, 1853 Gadsden Purchase was a strip of territory the United States purchased from Mexico following negotiations in 1853
