The map below shows the expansion of the Aztec Empire under a series of rulers from 1427 CE to 1519 CE. Use the map to answer the following question:

What does this map demonstrate about the sites of ancient cites in Mesoamerica?

The cities were concentrated in interior parts of Central America and southern Mexico.
The cities were often at war with each other for the few available resources.
The cities were large centers of culture for their respective areas.
The cities were only important and long-lasting when they had easy access to water.