13,000 years or earlier?

I find this scientific question fascinating: when did people reach the Americas? 13,000 years ago is the 'accepted' date, based on the opening of a land passage between the Cordilleran and Laurentide Ice Sheets. But that date is not as certain as it may sound, plus the formation of an ice-free corridor does not mean people immediately followed it. Then there's the idea that people traveling via boats along the shore maybe as early as 16,000 years ago.

Below a map from Source 1 below showing the current evidence - interesting!

1. Evidence grows that peopling of the Americas began more than 20,000 years ago (Nature, 222 July 2020).
2. Tools suggest people reached Americas early (Science, 24 July 2020)