[hypertele-Xii]

Wikipedia disagrees with you:

> The Classic Maya collapse is one of the greatest unsolved mysteries in archaeology. [...] Over 80 different theories or variations of theories attempting to explain the Classic Maya collapse have been identified. From climate change to deforestation to lack of action by Maya kings, there is no universally accepted collapse theory, [...]

What's your source or authority for claiming it was definitively the conquistadores?

[makomk]

If the dating estimates in the article are right, I think this might even have been caused by the prior Preclassic Collapse a few centuries before that. Remember, the dates given are a full two millenia before colonialism and a lot can happen to cause societies to change and history and knowledge to be lost over that timescale; our historical knowledge of much of Europe during this time period isn't exactly great either.