You referred to the northern states where segregation was not the law but was practised anyway. I'm probably a little older than you are, and I do remember the situation in Detroit which was quite prevalent back in the 1950s. There would be white neighbourhoods and black neighbourhoods. Maybe a house on a white street would be sold to a black family, and before long all the white families moved off that street. It then became a black neighbourhood.
Does this happen in Egypt with people and religions?