"State interference" is a term free market fundamentalists use when they mean "rich people should be a law unto themselves".

And no, never in all history has a lack of "state interference" reduced inequality - histories greatest inequalities have consistently been associated with insufficient, not excessive, regulations. And only ever been corrected *by* regulations, taxes and social upliftment programs.

It's no surprize that, the greatest wealth production in the history of the richest country on earth, and history's single greatest upliftment of a people (producing the first society ever where the middle class outnumbered the poor - and by a huge margin) happened during F.D.R's New Deal era - probably the closest the USA ever came to serious 'socialism'*

*Using Ivo's definition which the rest of us would call a social-democratic welfare state.