The Adams-Onís Treaty of 1819, a landmark agreement, ceded Florida to the United States and defined the boundary between U.S. and Spanish territories in North America.
The Adams-Onís Treaty, also known as the Transcontinental Treaty, was signed in 1819 between the United States and Spain. This pivotal agreement resulted in the cession of Florida to the United States and established a clear boundary between U.S. and Spanish territories, stretching from the Gulf of Mexico to the Pacific Ocean. Negotiated by John Quincy Adams for the United States and Luis de Onís for Spain, the treaty resolved longstanding territorial disputes and marked a significant expansion of U.S. territory. It also reflected the waning influence of Spain in the Americas and the growing power of the United States. The treaty had profound implications for the geopolitical landscape of North America, influencing future territorial negotiations and expansions.
Chapters
Timeline
1817-12-01
First Seminole War Begins
The First Seminole War erupted as U.S. forces, led by General Andrew Jackson, invaded Spanish Florida to suppress Seminole resistance and capture runaway slaves, highlighting the instability of the region.
1818-01-01
Negotiations Begin
Formal negotiations between the United States and Spain commenced in Washington, D.C., with John Quincy Adams and Luis de Onís representing their respective nations.
1819-02-22
Adams-Onís Treaty Signed
The Adams-Onís Treaty was signed in Washington, D.C., ceding Florida to the United States and establishing a clear boundary between U.S. and Spanish territories.
1820-10-24
Spanish Ratification
The Spanish government ratified the Adams-Onís Treaty, following political delays, finalizing the agreement between the two nations.
1821-02-24
U.S. Senate Ratification
The U.S. Senate ratified the Adams-Onís Treaty, officially incorporating Florida into the United States and resolving longstanding territorial disputes.
1821-07-10
Florida Officially Transferred
Florida was officially transferred to the United States, marking the beginning of American governance and the integration of the territory into the nation.
1823-12-02
Monroe Doctrine Declared
President James Monroe declared the Monroe Doctrine, asserting U.S. opposition to European colonization in the Americas, influenced by the territorial gains from the Adams-Onís Treaty.
1830-01-01
Indian Removal Act Passed
The U.S. Congress passed the Indian Removal Act, leading to the forced relocation of Native American tribes from the southeastern United States, including those in Florida.
1845-03-03
Florida Becomes a State
Florida was admitted as the 27th state of the United States, following its territorial acquisition through the Adams-Onís Treaty.
1846-06-15
Oregon Treaty Signed
The Oregon Treaty was signed between the United States and Britain, resolving boundary disputes in the Pacific Northwest, influenced by the precedent set by the Adams-Onís Treaty.
Connected Across The Archives
Explore specific connections to other archives—civilizations, conflicts, dynasties, and companies that share history with this treaty.
Civilization Archive
(3)American Civilization
The Adams-Onís Treaty, following America's independence, crucially defined U.S. territorial expansion, influencing the nation's geopolitical landscape.
Aztec Civilization
The Adams-Onís Treaty formalized territorial claims influenced by earlier Spanish conquests, including those over former Aztec lands.
Inca Civilization
The Inca Empire's territorial expansion set precedents that influenced the territorial negotiations of the Adams-Onís Treaty.
