Good point. The North American ice sheets began to recede 15,000 years ago and sea levels rose over 100 feet all over the world.
Imo, they were most probably coast hopping.
Moving by sea and landing when they needed to and establishing camps. Some camps became permanent. All of those would be under a lot of water now.
Good point. The North American ice sheets began to recede 15,000 years ago and sea levels rose over 100 feet all over the world.