Their homes, utensils, clothes, jewelry and body adornments were very similar. They also had very similar sports and games. Similar were also the social organization and the division of social classes.
Each one of these civilizations had different styles in their art, but the techniques used to work the stone, the mud, the metal, the fabrics, the wood and other materials were very similar.
As for religion, all these cultures were polytheists and worshiped the same deities, but gave them different names, and most of them built pyramids for their temples. They were theocratic societies.
The trade between the Mesoamerican cultures boosted growth, social change and innovation. This allowed them to share scientific knowledge, such as measuring time, mathematics knowledge and rudimentary medicines for disease control.
Mesoamerica always had the same extension, and for a long time ranged from the center of the present Mexican Republic to Belize, Guatemala and parts of Honduras and El Salvador.