Also:
Most scientists now reject the idea that the first Americans came by land
More doubt cast on the idea that people took a land route to the Americas
Underwater discovery reveals 14,550 year-old Florida mastodon hunters
Incredible discovery places humans in California 130,000 years ago
The bit about ‘First’ always bugs me as it is so ephemeral, subject to incessant revisions as more data comes to the fore. It is also mostly immaterial to actual effects. So what if the Vikings or the Phoenicians or the Irish or the Chinese were first to ‘discover’ the Americas [after the Amerinds]? Their lasting effect was nil and Columbus / Spain were the ones who made the lasting discovery.
Don’t get me wrong, it is a good endeavor to keep looking for the older sites, especially the ones that pre-date the Clovis theory. Like plate-tectonics, some of these scientifical shibboleths need to have sunlight cast upon them. See Clarke’s 1st law: “When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.”
Ice-free during that time but somehow we're suffering global warming today.