a state of the southwestern US, on the Gulf of Mexico: the second largest state; part of Mexico from 1821 to 1836, when it was declared an independent republic; joined the US in 1845; consists chiefly of a plain, with a wide flat coastal belt rising up to the semiarid Sacramento and Davis Mountains of the southwest; a major producer of cotton, rice, and livestock; the chief US producer of oil and gas; a leading world supplier of sulphur. Capital: Austin. Pop: 22 118 509 (2003 est). Area: 678 927 sq km (262 134 sq miles)