Wanderlust World Wanderlust World Signed by U.S. Secretary of State John Quincy Adams and Spanish Minister Luis de Onís, this treaty resolved border disputes and reshaped territorial claims:
Spain ceded East and West Florida to the United States, completing U.S. control of the Gulf Coast.
The western boundary of the Louisiana Purchase was set along the Sabine River (Texas-Louisiana), then north along the Red and Arkansas Rivers to the 42nd parallel, and west to the Pacific. The U.S. relinquished claims to Texas (then Spanish).
Spain surrendered claims north of the 42nd parallel, strengthening the U.S. position in the Pacific Northwest (jointly occupied with Britain).
U.S. gained navigation rights on the Mississippi and its tributaries. Commercial provisions reduced tariffs.
Both nations pledged "permanent peace and friendship."
The treaty marked Spain's final retreat from the present-day U.S. Southeast and Pacific Northwest, advanced "Manifest Destiny," and established a clear (though later contested) U.S.-Mexico border. It was a diplomatic triumph for Adams.