-
1821
Mexico gains independence from Spain -
1836
Americans are defeated at the Alamo -
1841
John Tyler becomes president -
1842
Americans and British agree to the Webster-Ashburton Treaty -
1845
United States annexes Texas -
1846
Mexican American War begins -
1848
Treaty of Guadalupe Hidalgo ends the Mexican American war -
1853
With the Gadsden Purchase the United States acquires an additional 30,00 square miles from Mexico