The tract of land the United States received at the end of the Mexican-American War in 1848 was called

The 1848 Treaty of Guadalupe Hidalgo ended the Mexican-American War and transferred a large tract of land from Mexico to the United States. That territory was called the Mexican Cession. The Gadsden Purchase was a smaller land acquisition made later, in 1853.

AI-written and checked against the verified answer.