I just finished reading a fantastic book “1491” by Charles Mann. It’s the best guess, given the evidence we have today, at what the people on the two western continents were living like in pre-Columbian times. Of course there’s a lot of conjecture going on because the evidence is so scanty, but what has been discovered in the last 20 years paints an extraordinary picture of what life might have been like then.
It seems that the Nazca lines in Peru and Bolivia are often presented as some sort of evidence of ancient alien visitations, but Mann offers evidence that these marvelous earthworks were indeed done by humans. They have discovered canals, causeways, artificial lakes, and the mound-built outlines of animals covering hundreds of meters in size located from Peru and Bolivia all the way through the heart of the Amazon river valley and it’s Andean tributaries. These were not discovered before because of the rainforest jungle that now covers this huge area of land. New technologies allow archaeologists to survey the lay of the land under the canopy of the forest and a more and more fantastic world is being revealed.
Imagine millions and millions of humans living along the great river systems of South America. Civilizations that turned jungle into fields (maize and manioc and melons and beans and tomatoes, etc) twinned with a cultivated gardens of varieties of fruit (papaya, pineapple, etc.)and nut (cashews, brazilnut, etc.) orchards. Imagine large scale irrigation. Imagine huge excavated ponds that take advantage of the annual floods to hold fish for the rest of the year. Imagine living on the mounds of earth that were built from the excavations and how they would offer protection from the floods.
Then in the 16th century up to 80% of these populations were decimated by diseases and eventually the wild jungle reclaimed all of this territory except for the occasional pocket of hunters/gatherers who managed to eke out a living in the rainforest. (Mann believes that the Amazonians entirely disappeared and that new populations of more primitive peoples - like the Yanomami - migrated into the Amazonian regions after the 16th century.) The Nazca plains were abandoned many centuries before the arrival of Europeans, but what remains on these windswept plateaus is the evidence of similar cultures that once thrived in those regions when the landscape was still agriculturally productive. Evidence of huge swaths of terraced fields on the slopes of the Eastern Andes show that agriculture and aquaculture were practiced there just as they are on the Eastern slopes of the Himalayas in China and Tibet.