A new study just came out confirming that the arrival of Europeans in the New World wiped out a lot of the genetic diversity.  "An international team of scientists has sequenced mitochondrial DNA from skeletons and mummies of indigenous Americans ranging from 8,600 to 500 years ago. They compared this new data to the DNA of modern Native American populations and found that the old sequences were mysteriously missing. This doesn't mean that all indigenous Americans died off, study lead autho