Spanish granted citizenship and protection from the crown to everybody playing under their rules. Spanish crown and Christianity promises should look shocking and also as 'best deal in my life' compared to the previous situation.

And as most military based societies, Aztecs had also a big problem with management of ecology and natural resources, caused with their own development, big cities with a less than optimum management of fecal waters, and never ending wars.

Deforestation came with dry spells and agriculture suffered while they were trying to negotiate a solution with the stars. All the social structure was supported by a lot of drugs abuse, probably.