Texas Independence and the war with Mexico By FoamSoapxl Feb 20, 1690 Texas is a province of Spain. Period: Jan 1, 1800 to Dec 31, 1850 Texas Jan 1, 1821 Spain control over Mexico ends. Texas under Mexican control. Mar 1, 1836 Texas becomes a nation. Feb 19, 1846 Texas joins the Uinted Sates as a state. Nov 1, 1860 Texas secedes from the Union. Feb 23, 1870 Texas is re-addmitted to the Union