If it weren't the fact that US cities cannot restrict the free migration of individuals, almost all of them would ban anyone moving there who didn't make above the average income for the area. Hawaii's last Republic governor tried every possible step to kick out the Marshallese, which is fucking hilarious considering how few of them there are globally.
If it wasn't for the US constitution you'd have giant slums in the interstitial space between cities, with a few zones stylized after the Jewish Autonomous Oblast here and there as well.