To this, I would add redneck culture too.
The ones who seem to have lost everything are the liberals on both coasts.

African-American culture is one I don't know much about, however, I do know it is very different from African culture.

Mexican-American and Native-American cultures are a weird thing. They are like there, but not there.

I anticipate that borders are going to collapse. As in, around your house you have a strong fence. Around your 20 acres you have a good fence. Around your 100 acres you have signs ever so often and a falling down barbed wire fence. So too, will communities/cities/nations have a strong area and a gray area.

It will be interesting to see what happens with culture as this collapse, or re-integration happens.