Mexican War

On May 11, 1846, President Polk asked Congress to declare war on Mexico. The Treaty of Guadalupe Hidalgo ended the Mexican War; it was signed on February 2, 1848. By this treaty, the United States gained California, Arizona, and Texas, north of the Rio Grande. The U.S. paid Mexico $15,000,000 and offered U.S. citizenship to any Mexicans who lived in the new territory.