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The United States gained East Florida through the Adams-Onís Treaty in 1819, settling a border dispute with Spain.
The United States gained East Florida through the Adams-Onís Treaty, also known as the Transcontinental Treaty, in 1819. This treaty settled the border dispute between the United States and Spain, with Florida being transferred to the United States as a result.
Contrary to the options provided, the United States did not gain the entirety of the Missouri Territory, the northern section of the California Territory, or the Oregon Territory through the Adams-Onís Treaty.
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