When and Why Spain Ceded Florida to the U.S. (1819)
Via the Adams–Onís Treaty (signed Feb 22, 1819; ratified 1821), Spain ceded East and West Florida to the United States.
Why Spain Relinquished Florida
- Financial strain: Maintaining distant, low-revenue colonies was unsustainable.
- U.S. Pressure: American settlers, military incursions (Jackson), and expansionism made retention untenable.
- Diplomatic Trade-off: Spain gained Texas (recognized as Spanish/Mexican) and defined western U.S. border, improving relations.
U.S. Gains
Florida + claims to Oregon Country; boundary set at Sabine River → Red River → Arkansas River → 42nd parallel (Pacific).
The treaty stabilized North American borders for decades.
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