To transport goods

To move water into populated areas

To build roads

To create defense structures

To serve as a military base

To act as a public gathering place and market

To store food

To house the royal family

Natural disasters

Invasion by enemies

Weakening of the city's power

Economic collapse

To transport soldiers

To move water into cities

To build bridges

To create trade routes

Water

Land

Food

Labor

A religious site

A trade center

The capital of the Aztec Empire

A military base

To expand the empire

To get resources not native to a region

To spread religion

To conquer new lands