1. Exurban areas are often more rapidly racially diversified than the post war suburbs were. Examples can be seen in places like Orange County, NY or, to a lesser degree, Chester County, PA which have sizeable populations of blacks/Asians/Hispanics compared to the lily-white suburbs of postwar Long Island and South Jersey. Then you have places like Palmdale and the rest of the Antelope Valley in Los Angeles County where Hispanics and blacks equal whites in terms of total population, although these exurban areas were farms or desert only 15-20 years ago.
2. "Latent" white ethnic enclaves? Where? It is nearly impossible for white folks or any folks for that matter to maintain ethnicity past the 3rd generation. According to the census bureau, nearly 90% (!) of all Polish Americans marry non-Polish Americans (as a Polish/Italian hybrid myself, I can attest to this). An Italian American from Pennsylvania who moves to Phoenix or Sarasota will simply become part of the assimilated white non-ethnic culture that dominates said areas.
Chester County suburbs are overwhelmingly white. The black population is almost entirely in Coatesville, which is an old steel town. The Hispanic population is a population of trailer dwellers picking Mushrooms in the farming region in the south of the county, not ordinary suburbanites. County-wide statistics can be very deceptive.
Then you have places like Palmdale and the rest of the Antelope Valley in Los Angeles County where Hispanics and blacks equal whites in terms of total population, although these exurban areas were farms or desert only 15-20 years ago.
California is a very poor example given its radical racial distinction from the American heartland and American south at this point in time.
2. "Latent" white ethnic enclaves? Where?
Off the top of my head: the Anthricite region of Pennsylvania, the little Scandanavia of upstate Wisconsin and Minnesota, West Virginia and Kentucky and North Carolina hillbilly country, Acadiana, Frenchified northern Maine, the German country of southern Minnesota, South Dakota, North Dakota, etc.
It is nearly impossible for white folks or any folks for that matter to maintain ethnicity past the 3rd generation.
Until my parents married, their families had maintained 10 generations of strict ethnic seperatism in the US (German and English) since the 1600-1700's. I don't think that is that unusual. Isn't George Bush's family still all English?
According to the census bureau, nearly 90% (!) of all Polish Americans marry non-Polish Americans (as a Polish/Italian hybrid myself, I can attest to this). An Italian American from Pennsylvania who moves to Phoenix or Sarasota will simply become part of the assimilated white non-ethnic culture that dominates said areas.
That's because Florida is not segregated by ethnicity the way parts of Pennsylvania, Wisconsin, etc. still are, and there is no sense of particular community. Sarasota doesn't have German, Polish, Irish, Italian, English, Jewish, etc. neighborhoods the way Philadelphia, Pittsburgh, or Milwaukee do.