The problem we Aztecs faced were getting to places and growing food
Tenochtitlan was a city of great wealth, obtained through the spoils of tribute from conquered regions. ... Its network of streets and canals teemed with canoes that transported people and goods within the city and across the lake to towns on the shore, to which it was linked by three raised causeways.
Aztec Warriors Fighting for Conquest and Captives. The Aztec Empire maintained its supremacy by war or threat of war against its neighboring areas. Aztecs engaged in war for two primary reasons: for conquest to reap tribute or to take captives for religious sacrifices necessary to satisfy the gods.