Historical Map of the United
States: Expansion 1836-1853
Republic of Texas, 1836-1845; annexed by U.S. 1845
Disputed area: Claimed by Texas 1836-1845; claimed by U.S.
Mexican Cession, 1848
When Texas was officially recognized
as a state in 1845, it included the light-gray area, which
was also claimed by Mexico. The
Treaty of Guadalupe Hidalgo
resolved this dispute, with
Texas claiming the disputed land.
In 1850, Texas transferred part of
this land to the federal government, which became the eastern
portion of the territory of New Mexico.
The U.S. Government
Accountability Office (GAO)
About the Texas Revolution
About the Mexican-American War