The Past - A Failed Future?

[BeardofPants]

osszie:
The loss of resources certainly is a valid explanation ......although I can't help but wonder why they did not rebuild in another location as the pyramids/temples seem to signify a very strong religion in that area at the time

Well, it is entirely possible that they did, but we'd never know about it given how dense that jungle is! They've estimated that we've only found about 1% of what could be in there. Plus there's that whole lack of funding thing.

G88:
Just a random thought here: could the ancient civilizations have formed some kind of an alliance, very early on, that was not recorded?(As in, during prehistory) Something simillar to our UN.

Not very likely in early early hominid development. Certain criteria are helpful for the development of something that complicated (beyond tribal/chiefdomship diplomacy)...sufficient population numbers being one of them. (ergh. don't get me started on the term "prehistory". It is only really applicable to civilisations that developed writing. What about those that didn't? Does that mean they have no history? I think not. ) However, during the Upper Palaeolithic there is evidence of trade networks... (venus figurines, etc) which could have led to diplomactic relations.