After the construction of the Pyramids Of Giza the aliens initiated a nuclear war in Sodom, Gomorrah, India and the African Sahel and South America’s Peru. That generation that had been exposed to Alien technology was wiped out.
Who made this runway on top of a mountain in South America 7000B.C ? Even with today’s caterpillar earthmovers we can’t.
I am not talking about Mayans. There were other much older civilizations in Chile and Peru, they were the Incas. There are so many unexplainable lines on the Nazca plateau.
Overpopulation, environmental degradation, warfare, shifting trade routes and extended drought,new diseases introduced by the spaniards did the mayans in,the rest were just cleared for occupation