One large group of citizens avoids, and is avoided by, the otherjust look at patterns of residential segregation. The traditional American approach to dire social problems is to move away from them: hence white flight, the growth of gated communities, new townships in the desert, and so on. That cant go on. The USA is big, but not so big that we can keep running away from each other indefinitely.
** We moved out to Long Island right before the area of Rochdale took the nosedive. My father didn't think it was safe for us to live there anymore. The man that lived next to the house we moved into did not want any black people living next to him. One already moved in next door to him and my mother irritated him more because she was with a white man. I had a lot of white friends but boy they disappeared one after another. My nabe wasn't violent but it got to be a very lonely place. I've been on both sides of the white flight thing. Some people move because they just do not like a person, or persons.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus