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Spanish invaders that conquered the Aztecs were way more advanced and were believed to be gods by the Aztexs when they first arrived. The Spanish also had the help og the Aztecs rival tribes.
Aztecs flourished from 1428 to 1519, when they were eliminated by Spanish invaders
they were forced into slavery by Cortes, to plunder the Aztec's riches
the aztecs
When the Spanish arrived the Aztecs thought they were gods. When the Spanish seemed more intrested in the gold ornaments that the Aztecs wore then in the pyramids that were build for the gods was when several Aztecs started to disaprove of Montezuma's decision of housing the Spanish.
quetzalcoatl
The Aztecs.
The Aztecs had a lot of enemies and when the Spanish conquistadors arrived to Mexico the Aztec enemies were more than happy to help the Spanish destroy the Aztecs.
CuauhtemocSource: http://www.mexconnect.com/articles/1538-the-spanish-conquest-1519-1521
He was the leader of the Aztecs in Tenochtitlan when the Spanish arrived. Read more about him at the attached link.
No; they only started to decline when the Spanish started to attack them.
Hernan Cortez arrived at Tenochtitlan in 1519, so probably around this time.