An altar from the Teotihuacan culture, at the pre-Hispanic heart of what became Mexico, was discovered in Tikal National Park in Guatemala, the center of Mayan culture, demonstrating the interaction between the two societies, Guatemala's Culture and Sports Ministry announced Monday.
The spread of the mesoamerican ballgame already pretty much confirmed intermingling of cultures I would have thought? Although there is no ball court in Teotihuacan (at least that have been found yet).