Texas Timeline By Swagout Period: Jan 1, 1803 to Jan 1, 1850 Texas Apr 28, 1803 Texas was discovered/ bought with the Lousianna purchase supposedly... Feb 12, 1819 Adam-Onis treaty signed that gave Texas its ties to Mexico Oct 20, 1821 Moses Austin recieves land grant for Texas Jun 10, 1823 Mexico makes anti-immagration laws to limit amount of people in Texas. Nov 8, 1830 The Texans outnumbered the Mexicans and were agrowing threat to the Mexicans... Feb 13, 1835 Texas defeated the Mexicans in San Antonio Mar 2, 1836 The Texans declare independence from Mexico Mar 6, 1836 The battle of the Alamo takes place. Apr 12, 1836 Surprize attack on the mexicans lead the Mexicans to realize that Texas is independent May 14, 1836 Texas becomes an annex of the U.S. Dec 26, 1845 Texas becomes a state!!