Mayan civilization had pretty much disappeared long before 1492.
Hmmm... Forgot to include the "/s"... {:-)
The Mayans disappered due to food poisoning. They had invented mayanaise, which the they piled on avocados, but due to a lack of refrigeration caused a food poisoning pandemic that wiped out the Mayans. The last Mayan passed away at 12:37 PM CMT on the 27th of July, 1287 AD.