USA HISTORY

Detailed explanation-1: -The Adams-Onis, or Transcontinental, Treaty of 1819 followed shortly thereafter. Spain ceded Florida to the United States, and the Sabine River-a portion of the present Texas-Louisiana border-became the Southwestern boundary of the United States.

Detailed explanation-2: -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.

Detailed explanation-3: -After months of negotiations, the Adams-Onís Treaty was signed on February 22, 1819. In the treaty Spain gave East and West Florida to the United States, and the United States agreed to assume claims by citizens of the United States against Spain.

Detailed explanation-4: -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.