I thought it was just the English that worried about what class they were in,seems like were not the only ones eh?
The British class system was a pretty much a rigid thing, (the vestiges of which go back hundreds of years)where just how you dressed and your deportment advertised your class even before you opened your mouth.
The idea of what class you were had more to do with money,your family heritage,school and the land you owned all had a part to play of course money mattered but here in the States its really the only metric that really matters as in I,m upper middle class because I make six figures per year.