Finds in South America and in Florida have shot all the old "verities" in the ass. In Florida, both human artifacts as well as the dung of mastadon they hunted have been found in a sinkhole, and the layering along with the radio carbon dating make it almost certain that humans had reached northern Florida by 14,500 years ago.
Go incognito if need be to read this NYT article. Furthermore, quite some time ago, archaeologists in South America found human artifacts in extreme southern Chile, dating back 14,000 years.
You can forget that old Clovis horsiepoop--Smithsonian Magazine. They were not believed for years. Land bridge, or boat, or both, human beans has been here far longer than the long-standing narrative. The best part of science is when it blows the established academics out of the water.