The very first line of the Communist Maifest applies in spades to the United States today...."The histroy of all heretofore existing societies is the histroy of class struggle..."
I couldn't have said it better myself. Neither could I name all the different classes in American society today. How about the non-working people against the workers? Retirees against everyone else? The new minorities against yesterday's immigrants' children? I think I could go on, but you get the point.