The answer to all questions is racism. We don't have public transportation because it became illegal to forbid African Americans access, we don't have public parks and services, because you can no longer have ''whites only'' signs up, we don't have stores in these areas because you can't stop immigrants from owning stores that whites see as 'beneath them' to work in, farming your own yard is trashy, because slaves were only allowed to farm food for themselves in small plots right next to the shacks they were allowed to sleep in, and why do we have remote single housing areas you can only access with cars that are over priced? To get away from the black people they could no longer red line to prevent living near them, and to create school districts non whites couldn't be zoned for as they were priced out of the districts, and then they adjusted school funding so it was based on land value effectively creating whites only schools with high funding. As the white racist mom in the 70s who was upset about bussing said ''if you let your kids grow up around theirs, eventually they'll all start to mix''