There was no mention of the recent efforts to study the extremely wide human existence in the rain forested areas of the Amazon head waters. These were agricultural people.
It turns out that the rain forests being “destroyed” exposing the previous extensive remains are in effect weeds in the old croplands.
The extent of the human existence hidden by the forests are visible in radar and other such methods.
Yup. The ancient big civs began and thrived in the major riverine basins (Nile, Euphrates, Indus, Yangtze, Danube, etc) and the Amazon was left off that list. I think that’s more the result of the ‘noble savage’ bias that persists today. If someone had wanted to look, they’d have found the old settlement sites, even without lidar and satellite eyes.