USA HISTORY

Detailed explanation-1: -Answer: Texas. A reason the United States was able to acquire Florida in the Adams-Onís Treaty was that it agreed to give up claims on Texas. The Adam-Onis treaty is also known as the Florida treaty.

Detailed explanation-2: -Florida had become a burden to Spain, which could not afford to send settlers or garrisons, so the Spanish government decided to cede the territory to the United States in exchange for settling the boundary dispute along the Sabine River in Spanish Texas.

Detailed explanation-3: -Gaining control of Florida for the United States would mean gaining control of the Mississippi River. That was an important route for trade. At the same time, Britain also wanted to regain control of Florida. Finally in 1821, the United States was successful in purchasing Florida from Spain.

Detailed explanation-4: -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.

Detailed explanation-5: -Ultimately, Spain agreed to the terms of the Adams-Onis Treaty (also called the Transcontinental Treaty): The United States officially received both West Florida and East Florida. Spain gave up all claims to the Oregon Territory (located in the Pacific Northwest).