Tbh with the sheer scale of America I doubt even mass starvation will work. The government could probably just keep the states immediately around the capitol sated and leave the rest of the country to die and most people won't be able to afford travel to the capitol to riot. I bring this up in every thread but to travel from the west coast to Maryland to start a riot is the same distance as traveling from Ireland to Moscow to riot. And we have barely functional trains.