Teotihuacan is an enigma of sorts. For a site of it's size and grandeur, we still haven't completely understood who the Teotihuacanos were. We know it's citizenry was cosmopolitan, consisting of the locals, Oaxacan, Mayans, and other surrounding ethnicity. The city is analogous to how some American cities, such as Detroit, are divided among ethnic groups. We do know about the daily lives of it's citizenry, thanks to many surviving depictions of them and we do know that they greatly influenced surrounding civilizations.