I said 50-60 because the men marry outside their race at a little over 50%, and the women marry outside at 60%. On both ends, they are eradicating their genetic ancestry. They're a completely destroyed nation whose history and culture is on life support largely from whites and "natives" who are in reality only 1/64th Amerindian. But yes, most of the interracial marriages are with whites. Partially because they mostly live in areas that are ~95% white, and also because a lot of them have a substantial amount of white admixture to begin with. Somewhere around 20% of people who identify as "native American" are actually full-blooded. An educated guess would say there are probably less than a million of them left.