Should we require immigrants to settle all over the USA instead of concentrating in a few places?

There are 3007 counties in the United States. Today almost all h1b, greencard, and other employment visa applications target jobs in only a handful of counties, such as Santa Clara county CA, San Francisco city and county, and King county WA. This slows the assimilation of immigrants who surround themselves with workplaces and communities with only other immigrants from the same country, and their kids wind up in schools with only other immigrant children. There's lots of talk of removing the country cap on i485 greencard applications, which would alleviate a great unfairness but likely worsen the problem of immigrants failing to assimilate. So here's a proposal: 1. Remove caps on where people can come from 2. Implement caps on where they can go Specifically limit the number of visas that can be issued to a single county (not country) in a year. Perhaps to no more than 1 percent of the total visas issued per county. This would require immigrants to settle all over the United States instead of crowding into ghettos (however be affluent) where they fail to Americanize. It would also spread the economic benefits of immigration to more parts of the country. After immigrants became citizens or permanent residents they would be able to move wherever they wanted, but they would start out for the first 3 to 5 years while on work visas settling in different places around the country and hopefully then making a permanent home there.