When did the Mexican Spanish War end?
Mexico was granted Independence.
Actually, no former Spanish territories have become established states inside the United States. The end treaty of the Spanish-American war resulted in U.S. control over the Phillippines, Guam, and Puerto Rico. That said, the inhabitants of these territories are full-fledged U.S. citizens. This topic is generally confused for the Mexican-American War. The end treaty of the MEXICAN-American war saw Mexico cede control of Texas and New Mexico to the United States.