There was more or less continual contact between Siberia and what's now Alaska in pre-Columbian times. Here are a few older answers that address this:

https://www.reddit.com/r/AskHistorians/comments/7prqnp/is_there_any_evidence_of_precolombian_crossings/

https://www.reddit.com/r/AskHistorians/comments/4l2v37/was_there_contact_across_the_bering_strait_in/

https://www.reddit.com/r/AskHistorians/comments/1fmljj/how_come_america_was_not_discovered_via_the/cabrg0t/

and also check out this roundup of older threads: https://www.reddit.com/r/AskHistorians/comments/3l444c/precolumbus_was_there_contact_between_the_peoples/