Originally Posted by
Mug Ruith
It was 94% white in the 1960s and the vast majority of non-whites were blacks in the South. In other words the vast majority of the USA was white and in most places you likely would not encounter any non-whites.
As to the OP, language easily. While language is important, it is something that can easily revived if one is so inclined...look at the revival of Hebrew in Israel. Once your race is gone, it's gone for good. Even if you lost your language for good it wouldn't be as transformative to a nation as a change in race.