English has its barbarian roots overlaid with French words from the Norman conquest of England. The French aristocracy moved in and took over. The modern result of that is the "English" words of French origin are tells of upper class origins. Americans use that, consciously or unconsciously. Sometimes it's referred to as "coded speech".
For example, someone from upper class America will "purchase" something while a lower class person will "buy" it.
It's not just slight accent changes that distinguish class in America.