The Aztecs are dominated northern Mexico at the time of the Spanish in early 16th century. Aztecs settled on several island in lake Texcoco where, in 1325, they founded the town of Tenochtitlan, modern day "Mexico City" Aztecs Created an empire during the 15th that surpassed in size in the Americas only by that Incas.
The Aztec people of Mexico lived in the Mexican Valley between 12th and 16th century A.D. The Aztec people built temple pyramids at Tenochtitlan, their capital, and Tepoztlan, Xochicalco, Cempoala and Calixtlahuaca.

The Mesoamerican civilizations such as the Teotihuacanos,Maya, Totonacs and Huastecs the proto-Aztecs became agriculturalists and achieved the same levels of technology as their neighbouring peoples. They held on to their language, much of their religious systems and probably aspects of their previous social customs, and the foundations of aztec society were developed as a synthesis between mesoamerican societies and aztec traditions, although today it cannot easily be discerned which parts come from where. Aztec society was not isolated from the larger mesoamerican context, and in fact most aspects of it were similar in structure to what existed in the surrounding societies.