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The convention or treaty of 1818
The US received Florida through the Adams-Onis Treaty with Spain.
The US State of Florida was purchased from Spain in 1819. It became the 27th State in 1845.
jointly occupied with Britain Oregon treaty- 49th parallel
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 States, Don Luis de Onís, and signed in February 1819. The principal elements in the treaty were the acquisition of Florida by the United States and the establishment of a boundary line between Spanish territory and the United States.