From my memory banks, without doing any research I can think of three:

(1) The prohibition on exporting oil, just recently lifted

(2) Subsidies on corn for ethanol (a stupid thing to do)

(3) Lack of environmental controls on fracking. This is a negative subsidy, in that the absence of sensible policies is advantageous to a chosen industry

In the civilised world we think your agricultural subsidies (and the enormous amount of subsidies in all sorts of areas) are part of what makes the USA a rouge state.

sheesh