when did the us army fight in the mexican american war
Mexican–American War The Mexicanâ€“American War,[a] also known as the Mexican War and in Mexico the American intervention in Mexico,[b] was an armed conflict between the United States of America and the United Mexican States (Mexico) from 1846 to 1848. It followed in the wake of the 1845 American annexation of the independent Republic of Texas, which Mexico still considered its northeastern province and a part of its territory after its de facto secession in the 1836 Texas Revolution a decade earlier.