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Adams-Onís Treaty (1819)
The Adams-Onís Treaty of 1819, also called the Florida Purchase Treaty and the Transcontinental Treaty, established a clear boundary between the United States and territory claimed by Spain in North America. By the terms of the treaty, Spain also renounced claims to West Florida, ceded East Florida to the United States, and limited Spanish claims to the northwest area of the continent to below the 42nd parallel. For its part, the United States agreed that Spanish Texas was not a part of the Louisiana Purchase and paid American claims against the Spanish government amounting to $5 million. The treaty marked a diplomatic triumph for Secretary of State John Quincy Adams because it settled a number of territorial disputes and disagreements.
The Louisiana Purchase of 1803 left ...