For anyone interested in this topic here is a link to an article with theories about the land bridge, people locating, etc.
https://www.theatlantic.com/science/archive/2017/10/a-brief-history-of-everyone-who-ever-lived/537942/
A New History of the First Peoples in the Americas Published Oct. 3, 2017 A 20 minute or so read.......
Thanks!