December 29, 1845
According with International Boundary delimitation, U.S.A annexes the Mexican state of Texas, following the Manifest Destiny doctrine. For others, the Republic of Texas, which had been independent since the Texas Revolution of 1836, is admitted as the 28th U.S. state.
Seal of Texas
Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States. The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in East Texas. Located in the South Central United States, Texas is bordered by Mexico to the south, New Mexico to the west, Oklahoma to the north, Arkansas to the northeast, and Louisiana to the east. Texas has an area of 268,820 square miles (696,200 km2), and a growing population of 25.1 million residents.