After the revolution, people were group according to class, which meant that if a person could make enough money, they could move up in society. Before that, citizens were proscribed into groups according to privledge. A citizen of the mean sort was considered rabble, while a citizen of the meddling or yeoman sort was considered a gentleman. Before the Rev., people of the lower sort were expected to bow when approached by a gentleman.
Politically, the U.S. had the first modern system of its sort, there was not a parliamentry system, nor was there direct democracy as described by Plato.