The Aztec city of Tenochtitlan became one of the richest cities in the world because Aztecs used tributes from conquered peoples to build Tenochtitlan into an impressive city.
Tenochtitlán was an Aztec city that flourished between A.D. 1325 and 1521. It It was built on an island on Lake Texcoco. In addition to this, it owned a system of canals and causeways that supplied the hundreds of thousands of people who lived there.