alt Hacker NewsI've heard that explanation as well. But I don't know if "recovered from human intervention" is a fair characterization since they couldn't have been more than a decade behind the smallpox/diseases.
Estimates range from 5 to 10 million people in the Amazonian Basin by the time Colombus reached the Americas (though some go as high as 20 million).
I don't think a few years is enough to erase all trace of human intervention. I think it was just so alien a concept to Europeans who kept very tidy woodlands like dehesa in Spain or the coppiced woodlands of Central Europe. As much as 10% of the soil in Amazonia was man-made terrapreta. And they spread what could best be translated as complex polycultural "orchards" of brazilnuts, aqui, coco, and more. Botanists have been puzzled for years by the hyperdominance patterns of some of these trees until anthropologists realized the human connection.
Anyways I guess what I'm saying is that the Amazonian landscape management is so radically different from what Europeans know that they likely just didn't realize what was before their eyes.
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A landscape does not become "pristine" a decade after millions of people disappear. The human influence would still be everywhere, but it would not necessarily look like European agriculture
There wasn't a single civilization there. The same way if you arrived in Greece during the roman period you'd have 2000 year old temples to look at and if you go there now you have both the 4000 year old ones and the 2000 year old ones. In the amazon some of the stuff that is there was ancient already at the time of the Discoveries.