|Metapedia Fundraiser 2018: The Internet is the foremost field in the metapolitical battle of our time. Help us hold down the front.|
The Mexican–American War was an armed conflict between the United States and Mexico from 1846 to 1848 in the wake of the 1845 U.S. annexation of Texas. Mexico claimed ownership of Texas as a breakaway province and refused to recognize the secession and subsequent military victory by Texas in 1836.
The most important consequence of the war for the United States was the Mexican Cession, in which the Mexican territories of Alta California and Santa Fé de Nuevo México were ceded to the United States under the terms of the Treaty of Guadalupe Hidalgo. In Mexico, the enormous loss of territory following the war encouraged its government to enact policies to colonize its remaining northern territories as a hedge against further losses. In addition the Rio Grande river became the boundary between Texas and Mexico, and Mexico never again claimed ownership of Texas.