Ice Age Columbus, Who Were The First Americans?

This is from a mainstream perspective so it doesn't include evidence like the Piri Reis, Oronteus Finaeus, Mercator and Buache maps, which were copied lost ancient source maps that show Antartica ice free, nor does it include other pieces of evidence, like the Olmec heads, that show that the Atlantic was crossed in the ancient world. But this documentary does mention that there is genetic evidence that American Indians do have DNA that isn't just from the Mongolian region, but also from the European region as well. It's well known that there was an ice bridge connecting Siberia to America during the ice age, but there was also an ice bridge connecting Europe to America.