Why Was Mexico City Built on a Lake Island?

The Mexica (Aztecs) founded Tenochtitlan in 1325 on an island in Lake Texcoco, guided by their patron god Huitzilopochtli's prophecy (eagle on a cactus with a snake). The site offered:

1. Defense: Water barriers hindered attackers.
2. Fresh water: Springs and aqueducts (Chapultepec) supplied the city.
3. Agriculture: Chinampas (artificial "floating gardens") yielded multiple harvests/year.
4. Trade hub: Central location in the Valley of Mexico linked highland and lowland routes.
5. Climate: 2,240 m elevation gave temperate conditions.
6. Symbolic/religious significance: Fulfilled cosmological destiny.

After the Spanish conquest (1521), the lake was gradually drained; modern Mexico City sprawls over the former lakebed, causing subsidence and water challenges.