Conflicts & Resolutions · Treaty

Adams–Onís Treaty

1819 · 19th century · Also known as Transcontinental Treaty, Florida Purchase Treaty

The Adams–Onís Treaty, signed in Washington on 22 February 1819 by the American secretary of state John Quincy Adams and the Spanish minister Luis de Onís, transferred Florida from Spain to the United States. It also fixed the boundary between the United States and New Spain from the Gulf of Mexico to the Pacific. The United States assumed up to five million dollars of its citizens' claims against Spain, and the treaty took effect in 1821.

Adams–Onís Treaty
Image: CC BY-SA 2.5 · Wikimedia Commons

Mentioned in 1 state history

Spanish Florida

See also

Cite this entry
APA
The Epoch Institute. (2026). Adams–Onís Treaty. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/adams-onis-treaty
MLA
“Adams–Onís Treaty.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/adams-onis-treaty. Accessed .
Chicago
The Epoch Institute. “Adams–Onís Treaty.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/adams-onis-treaty.
Harvard
The Epoch Institute (2026) ‘Adams–Onís Treaty’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/adams-onis-treaty (Accessed: ).

Last reviewed October 2026Random entry ↻