Leah Rothstein in an interview by Aaron Sankon, “The Government Segregated America. Here’s How Everyday People Desegregate It”:
One strategy that some communities and a few states have already adopted, and which several others are considering, is changing zoning law. That is a locally controlled policy. Often, these exclusive communities are zoned only to allow for single-family homes to be built in them. It’s called exclusionary zoning. It took the place of race-based zoning when that was outlawed. By ensuring these communities only allow single-family homes, often on large lots, it limits the amount of housing that can be built in that community. It ensures that the only housing there will be expensive—unaffordable to low-income families and moderate-income families that don’t have intergenerational wealth to pay for a down payment.