The Amazon Basin was heavily affected by human activity, yes- (I'm assuming you're talking about the manmade terra preta soil) but the Amazon rainforest itself long predates human activity in the Americas.
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the Amazon rainforest itself long predates human activity in the Americas.
how could that be? how could the rainforest even EXIST without the nurturing dust from the Sahara desert?
The Sahara is around 2-3 million years old, having started around the same time as the Ice Ages did. So, uh, yeah, it's been providing nutrients in the form of windborn dust to the Amazon for longer than the human race has been around, let alone human civilization.
but..b ut..but...din't you say the sahara was caused by irrigation?
No, I said the Fertile Crescent was rendered into a desert by irrigation by the ancient Mesopotamians. Fun fact, there weren't any Sumerians farming in the Sahara.
Or, awww, did you thing the Mesopotamians lived in the Sahara? How cute.