The fall of Teotihuacan in the seventh century precipitates a period of dislocation. Many peoples are uprooted to new territories, forming new political and trade alliances, and creating eclectic art styles. A number of smaller cities in central Mexico compete for control and prestige. On the coast of the Gulf of Mexico, El Tajín develops into an extensive site and appears to have been the center for important ceremonial games. In the Valley of Oaxaca, small regional centers increase their power at the expense of Monte Albán, and the Mixtecs have a growing presence. By 900 A.D., the Toltec culture is the new centralizing force in Mesoamerica.