Equality is as American as freedom and liberty - what happened to "Equality University?"

http://www.economist.com/node/21564413

'There was little social mobility except, as Elizabeth found, through marriage. Colonial America was an exception to this feudal sclerosis. Research by Peter Lindert and Jeffrey Williamson shows that on the eve of the American revolution incomes in the 13 colonies that formed the United States were more equal than in virtually “any other place on the planet”.'