The war with mexico. This is a list of the major causes and effects of the Mexican-American War, which grew from a border dispute after the United States annexed Texas in 1845 and resulted in the United States’ acquisition of more than 500,000 square miles (1,300,000 square kilometers) of Mexican territory. In 1845 Polk sent Taylor (Old Rough and Ready), a veteran of the War of 1812, the Black Hawk War, and the second Seminole War, with an army to the Rio Grande. to acquire what is today Texas, Arizona, New Mexico, Colorado, Nevada and California. Although Mexico was defeated on the battlefield, negotiating peace was politically complex. Army, under Major General Winfield Scott, invaded the Mexican heartland via an amphibious landing at the port of Veracruz on March 9 and captured the capital, Mexico City, in September 1847. The United States received the disputed Texan territory, as well as New Mexico territory and California. On May 13, 1846, the United States declared war on Mexico, beginning the Mexican-American War. Then, on May 26, 1848, both sides ratified the peace treaty that ended the conflict. The Spanish in North America and the Treaty of. Jul 4, 2025 ยท The Mexican-American War (1846-1848) was a conflict between the United States and Mexico, sparked by the US annexation of Texas in 1845. vdou wrx qom6p h82jmzu yd i30ekj ixauq ont el rx