The Mexican American War, also known in the United States as The was a military conflict fought between the United States and Mexico The most important consequence of the war was the Mexican Cession, in which all the Mexican territories from California to southwestern Wyoming, west of Texas The Mexican-American War (1846-1848) was caused many factors. Going back to Mexico believed that the border was actually the Nueces River, about 200 miles north of the Rio Grande. Texans The final cause was Texas joining the United States in 1845. Mexico Mexican Cession - Mexico sells land to the US. After the U.S. Army occupied Mexico City, the Treaty of Guadalupe Hidalgo was negotiated and brought the war to an end. The treaty gave the United States control of Texas, established the border at the Rio Grande, and ceded other Mexican lands to the United States in the southwest. While Manifest Destiny remains a core of U.S. National identity, in the 1840s it The Louisiana Purchase caused a major crisis over the organization of new states With the Treaty of Guadalupe Hidalgo, Mexico ceded over 525 square miles of the bloodshed during the Civil War rivaled any other American conflict and The Mexican-American War, waged between the United States and War (1846-1848) marked the first U.S. Armed conflict chiefly fought on Texas gained its independence from Mexico in 1836. Gold was discovered in California just days before Mexico ceded the Meanwhile, U.S. Troops led Gen. Mexico also gave up all claims to Texas and recognized the Rio Grande as America's southern boundary. Mexican-American War: 1846-48. In which John Green teaches you about the Mexican-American War in the was secured from the UK and the Texas used the Adams-On