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Under the Onís-Adams Treaty of 1819 (also called the Transcontinental Treaty and ratified in 1821) the United States and Spain defined the western limits of the Louisiana Purchase and Spain surrendered its claims to the Pacific Northwest. In return, the United States recognized Spanish sovereignty over Texas.
The issue arose of the disagreement over the territorial boundaries of the purchase, the United States maintained the French claim that Louisiana included the Mississippi River and all lands whose waters flow to the Mississippi.
The catalyst for the negotiations between U.S. Secretary of State John Quincy Adams and the Spanish minister to the United States, Luís de Onís y Gonzalez, was border raids by Seminoles out of Spanish Florida.
The Adams-Onís Treaty also helped establish American land in Florida and made a claim on Oregon for the country in a more aggressive move. All of the territories mentioned in this treaty now remain American land and will not stop being American land unless some drastic turn of events occurs.
The Adams-Onis Treaty was an agreement between the United States and Spain signed in 1819 which established the southern border of the Louisiana Purchase. As part of the agreement, the United States obtained the territory of present-day Florida.
The key provisions of the treaty ceded all territories held by the Spanish crown in the West and East Floridas to the United States and established a “transcontinental” boundary west of the Mississippi River that allowed the United States direct access to the Pacific Ocean.