<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Texas lies between two major cultural spheres of Pre-Columbian North America: the Southwestern and the Plains areas . Archaeologists have found that three major indigenous cultures lived in this territory, and reached their developmental peak before the first European contact . These were: </P> <Ul> <Li> the Pueblo from the upper Rio Grande region, centered west of Texas; </Li> <Li> the Mississippian culture, also known as Mound Builders, which extended along the Mississippi River Valley east of Texas; and </Li> <Li> the civilizations of Mesoamerica, centered south of Texas . Influence of Teotihuacan in northern Mexico peaked around AD 500 and declined over the 8th to 10th centuries . </Li> </Ul>

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