I did not "confront" them. I mentioned that some of their artifacts (art) looked very similar to those I'd seen at Mayan sites and they recited a scripted response. When I rephrased my question they recited the script again.

I am not saying those Park Rangers are conspiring to hide the truth. I am saying they are not allowed to acknowledge or even discuss the possibility of a connection to any living descendants anywhere.

I've seen more than a few cases when "a random person attempts to advance" human knowledge and was completely dismissed by the "experts" and arrogant jackasses who later found out that random person was right.

A great example is where the Monarch Butterflies gather in winter. The guy who came back from Mexico back around the 1980-90s and told others he'd seen them in the mountains in Mexico was called a fool and a liar by all the experts until he showed them the next year. Of course, the Mexicans who lived near the site had known they come there for many generations but no experts had thought to ask them, or they dismissed them if they were told about it.

All told I'd estimate I've spent around 30-40 days exploring Mayan sites and the Cahokia Mounds. How much time have you spent on that?

Zero. I'm not an archeologist.