Ancient South American families built massive waterways by themselves

The La Mojana field systems in Colombia’s wetlands are some of the largest examples of monumental ancient engineering in South America. Encompassing an area about as large as Grand Canyon National Park, the network of canals and raised farming ridges are so vast that they’re even visible from airplanes. Archaeologists and historians have long assumed such complex and intricate endeavors must have required oversight from rigidly structured authorities,but new evidence suggests otherwi