While there are no laws barring someone from Ohio from moving to D.C. to look for work after college, cities can and do restrict interstate immigration. They can't issue visas but they control the supply of new housing and there's really not much incentive to move to a city without a place to live. Since little new housing is built in Manhattan, San Francisco and San Jose, would-be immigrants must outbid one another for phantom visas. That's a good result, I suppose, if you own property in Manhattan or San Jose, but it's not good for the immigrants and it's not good for the country as a whole.
Casa Robino
Shared Hospitality Excavations
