I don't know.
But, IMO, there is a lot more here to be discovered. For example, there are more pyramids in Mexico than the whole rest of the world combined...yet, you mention pyramids and everyone immediately thinks of Egypt. Incidently, the oldest pyramid in the world is in Greece, the second oldest is in Peru (Caral), also, the largest.
I agree that South and Central American civilizations do not get the respect that they deserve. Egypt and Mesopotamia had metal technology; the Americas did not. They were stone age. They didn't even have pack animals.
People wonder how the Egyptians built their pyramids? Try making larger, more complex structures without metal tools, horses, camels, or the wheel. They did it with stone knives and bearskins, literally. For them to do what they did with the technology that they had is truly amazing.
In fact it is estimated that over 90% of all pyramid cities in south america is still unreasearched.
You can see many if you fly over them, as pointed hills sticking out from beneath the canope.