I remember reading on the CDC website, they have a natality page that keeps up with births by characteristics and they ask about the father of the baby. So in Georgia, 90% of white women who give birth, had a white partner, only 3% had a black partner. In Alabama, only 2 or 3% of white females that gave birth or married, had a black partner. Both states are 30% black.
There are 2 white people for every black person in Alabama and Georgia. but only 1 out of 35 whites date and marry blacks.
What do you think is the reason why this happens?