Clovis culture
Idea about a coastal migration route: Research on the mitochondrial DNA of First Nations/Native Americans, was published in 2007. It suggests that the people of the New World may have diverged (or went away from each other and stayed away), genetically from Siberians as early as 20,000 years ago. One theory says that the Pacific coast of North America may have been free of ice, and maybe the first peoples in North America came down this route before the formation of the ice-free corridor.