What problem of the Aztec’s physical geography did the chinampas solve?

The Aztecs used chinampas for their crops. Chinampa is a method of farming that used small, rectangular areas to grow crops on the shallow lake beds in the Mexican valley.  They were essentially artificial islands created for the crops. They used chinampas because the Aztec civilization developed in the Valley of Mexico and it was surrounded by lakes and the land of unsuitable for agriculture

maybe you need to work on the pipes in the house. i am just saying this because you did not give any details.

your answer is

to dominate europe

and i know for a fact it can't be the others