<Tr> <Td> Oklahoma </Td> <Td> 3,930,864 </Td> <Td> 3,751,351 </Td> <Td> 7000478528935308910 ♠ + 4.79% </Td> <Td> 68,594.87 sq mi (177,659.9 km) </Td> <Td> 57 / sq mi (22 / km) </Td> </Tr> <Tr> <Td> Texas </Td> <Td> 28,304,596 </Td> <Td> 25,145,561 </Td> <Td> 7001125629927286169 ♠ + 12.56% </Td> <Td> 261,231.51 sq mi (676,586.5 km) </Td> <Td> 108 / sq mi (42 / km) </Td> </Tr> <Tr> <Td> Total </Td> <Td> 41,339,800 </Td> <Td> 37,348,108 </Td> <Td> 7001106878024450400 ♠ + 10.69% </Td> <Td> 564,718.43 sq mi (1,462,614.0 km) </Td> <Td> 73 / sq mi (28 / km) </Td> </Tr> <P> Human history in the Southwest begins with the arrival of the Clovis culture, a Paleo - Indian hunter - gatherer culture which arrived sometime around 9000 BC . This culture remained in the area for several millennia . At some point they were replaced by three great Pre-Columbian Indian cultures: the Ancestral Pueblo people, the Hohokam, and the Mogollon, all of which existed among other surrounding cultures including the Fremont and Patayan . Maize began to be cultivated in the region sometime during the early first millennium BC, but it took several hundred years for the native cultures to be dependent on it as a food source . As their dependence on maize grew, Pre-Columbian Indians began developing irrigation systems around 1500 . </P>

Industry in the southwest region of the us