The correct answer is C) to obtain western territory, including California and New Mexico.
President James Polk asked Congress to declare war on Mexico to obtain western territory, including California and New Mexico.
The United States President James K. Polk asked Congress to authorize a declaration of war on Mexico on May 13, 1846. Both countries were disputing the Texas territory. The armed confrontation with Mexico lasted two years and ended with the Treaty of Guadalupe Hidalgo that both countries signed on February 2, 1848. The Rio Grande finally became the southern border of Texas and the United States paid Mexico 15 million dollars for the territories of NewMexico and California.
