The only time I've heard anyone say "they weren't always White" was from the racist that lived next door to us when I was a child. I was a born in Baltimore and my parents grew up in the city, almost all the kids my age had at least one grand parent who spoke broken English or English with a brogue like my great aunt and one grandfather. So, it wasn't abnormal to socialize with Polish, Greek, Italian, Jewish, German and folks from Eastern Europe....we simply enjoyed the wonderful food, the weddings and all the other celebrations we were able to attend.
When I was about 9 my mother was taking to the neighbor next door over the fence and he made a rather startling remark about a new neighbor and referred to the family as (pick your racial slur) which startled me....I was confused and said "They're Italian" (I didn't recognize the hateful intent) and he said to me "Italians ain't nothing but a (hateful slur) turned inside out. It was at that point I was introduced to mindless hate, and also learned that some adults are assholes.
To this day I don't understand what anyone hopes to prove by splitting hairs over 'genetics', DNA or other piffle in hopes of making themselves sound superior. It's sad Max, don't do it.