If the europeans don't arrive to the New World in 1492,
1) when do you think contact between the Incas and the Aztecs (or their sucesor/s state/s) takes place?
2) how does this contact take place? Is it through the land route via the Panama itsmus, or through the maritime route (the Pacific or the Atlantic one)
3) what are the consequences of this encounter for both parts?