Why did war break out between the US and Mexico?

The Mexican-American War (1846-1848) was a conflict between the United States and Mexico that resulted in the annexation of the present-day American Southwest from Mexico. There were several factors that led to the outbreak of war, including:

1. Territorial disputes: Mexico and the United States had competing claims to the territory of Texas, which had declared independence from Mexico in 1836. The United States annexed Texas in 1845, which Mexico considered an act of war.

2. Manifest Destiny: Many Americans believed in the concept of Manifest Destiny, which held that the United States was destined to expand its territory across the continent. This ideology led to increased pressure for the annexation of Texas and other Mexican territories.

3. Economic interests: American settlers in Texas and other parts of the Southwest were eager to access the region's natural resources, including land for agriculture and minerals. They also sought to expand trade opportunities with Mexico.

4. Slavery: The issue of slavery played a significant role in the war. The United States was deeply divided over the issue, and many Southerners supported the annexation of Texas and the Southwest as a way to expand the territory where slavery was legal.

The Mexican-American War began when American forces under the command of Zachary Taylor crossed the Rio Grande into Mexico in 1846. The war lasted for two years and resulted in a decisive victory for the United States. Mexico was forced to cede the present-day American Southwest, including California, Nevada, Utah, Arizona, and New Mexico, to the United States. The war had a profound impact on both countries and shaped the course of American history.