The pyramid was built over 5,000 years ago, even before the pyramids of Egypt and Mesopotamia, a time when archeologists had believed the Amazon was populated only by hunter-gatherers.
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The Memphis Pyramid, formerly known as the Great American Pyramid and the Pyramid Arena, is a pyramid-shaped building located in downtown Memphis, Tennessee, United States, at the bank of the Mississippi River.
For example, the 18th Dynasty of the Egyptians dates from the 14th Century BC, whilst the Aztecs didn't begin to flourish in the Valley of Mexico till the 14th Century AD, making any contact or communication between the two cultures impossible.
Mesoamerican peoples built pyramids from around 1000 B.C. up until the time of the Spanish conquest in the early 16th century. (Egyptian pyramids are much older than American ones; the earliest Egyptian pyramid, the Pyramid of Djoser, was built in the 27 century BC).