when was the mexican american war

The Mexican–American War was fought from 1846 to 1848.

Basic timeline

• The war began on April 25, 1846, when Mexican and U.S. troops clashed north of the Rio Grande in disputed territory.

• The main fighting effectively ended in September 1847, after U.S. forces captured Mexico City.

• The conflict formally ended on February 2, 1848, with the signing of the Treaty of Guadalupe Hidalgo.

Why those dates matter

• 1846 marks the escalation of a border dispute following the U.S. annexation of Texas in 1845, which Mexico still claimed as its own.

• 1848 marks the treaty in which Mexico ceded large territories (including present-day California, Nevada, Utah, and parts of several other states) to the United States.

Information gathered from public forums or data available on the internet and portrayed here.