In the Post-classic period, Cholula (900–1521) grew to its largest size and returned to its status as a regionally dominant city. The city's location was strategic, on the trade routes between the Valley of Mexico, the Valley of Oaxaca and the Gulf of Mexico, making it a major mercantile center. A variant of an artistic style and iconography, especially in pottery, spread from Cholula to Culhuacán in and other areas in the Valley of Mexico, then to other areas in Mesoamerica. This cultural trait is called Mixteca-Puebla and it was spread by the vast trading networks that existed in Mesoamerica at that time. The split between the ethnic divisions of the city eventually would coalesce into three areas by the late pre-Hispanic period, which are now known by the names of San Pedro Cholula, San Andrés Cholula and San Isabel Cholula. Only the first two are considered part of the city today.