Actually, it wasn’t because other Black people moved in. It was because builders took advantage of cheap land. Built houses and younger White professionals moved in from other parts of metro Atlanta and out of the state and overwhelmed the more backward looking people.
When we walked into the community, the builder could care less what color we were as long as our credit was good and we had the down payment to get our house built - in 2016 a 3200 square foot house for $335K.
