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Adams–Onis Treaty

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Adams–Onis Treaty

To end tensions caused by the first Seminole War and establish the Louisiana Purchase's precise southern line, John Q. Adams negotiated this treaty with Luis de Onis, Spain's ambassador at Washington. Spain agreed to cede both East and West Florida to the US. The US gave up its claim to much of east and central Tex. under the Louisiana Purchase, and accepted the Sabine River as La.'s border. Spain and the US fixed their western boundary as the Red and Arkansas rivers, north along the Rockies' eastern slope, and then west along the 42nd parallel to the Pacific. The US gained 72,000 square miles, including Fla. and most of the Santa Fe Trail; it also reinforced the US claim to Oregon. Adams and Onis signed the agreement on 22 February 1819. The Senate ratified it on 19 February 1821, and the treaty went into effect three days later.