How did the US gain control of Texas California American southwest and Oregon territory?

* 1836: Texas declares independence from Mexico.

* 1845: Texas is annexed by the United States.

California and the American Southwest

* 1846-1848: Mexican-American War.

* 1848: Treaty of Guadalupe Hidalgo ends the war and gives the United States control of California and the American Southwest.

Oregon Territory

* 1846: Oregon Treaty divides the Oregon Territory between the United States and Great Britain.

* 1859: Oregon becomes the 33rd state of the United States.