The ancient Hopewell civilization of Ohio. Yes, Ohio. Guess where the world's largest collection of ancient geometric earthworks are? Yep, Ohio. And some surrounding states, but mostly Ohio.
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Bars and Dots, Maya date calculator software - https://www.barsanddots.com
Ed's day job is Director of Maya Exploration Center, a 501(c)3 non-profit
https://www.mayaexploration.org
Matt Savino's book Land Without a Continent
https://www.amazon.com/Land-Without-Continent-through-Central/dp/1959099728