When Mexico won its independence from Spain in 1821, Mexican Texas was part of the new nation. To encourage settlement, Mexican authorities allowed organized immigration from the United States, and by 1834, over 30,000 Anglos lived in Texas. Angry at the government in Mexico City, Texans fought and won the Texas Revolution in 1835-36 and became an independent nation, the Republic of Texas. Nine years later, in 1845, Texas joined the United States, becoming the 28th state. Source: http://en.wikipedia.org/wiki/History_of_Texas
For more information regarding the history of Texas, visit The Handbook of Texas Online sponsored by the Texas State Historical Association at: http://www.tshaonline.org/handbook/online/
Oklahoma on the north, Arkansas to the northeast, Louisiana to the east, the Gulf of Mexico and Mexico to the south, and New Mexico to the west.