OP is right. Whites include other races in stats when it makes them look good. Our population is way larger than 13%. Not to mention those who aren't counted in Census reports. Also all races have had negative birthrates for decades now except for Hispanics.
( I understand there are black, Asians multi racial etc people in thoose areas)
I grew up in an all-black neighborhood.....rural NC...High School was 50-50