According to this article, a new site in Florida has a nearly indisputable evidence for human occupation more than 14000 years ago.
"Stone tools and mastodon bones occur in an undisturbed geological context at the Page-Ladson site, Florida. Seventy-one radiocarbon ages show that ~14,550 calendar years ago (cal yr B.P.), people butchered or scavenged a mastodon next to a pond in a bedrock sinkhole within the Aucilla River. "http://advances.sciencemag.org/content/2/5/e1600375
And the popscience version.https://www.sciencenews.org/article/hun ... -years-ago
Is there much dispute anymore that pre-clovis peoples populated the Americas?