I think if you asked a North Korean today if they wanted "American expansionism" or their current state of affairs, the answer would be what any starving person would do, choose the lesser of two evils that feeds them.
I hardly think North Koreans would have a problem with democracy and freedom that feeds them than their leader which have failed them and forced to praise them at gun point.
It's funny because lot of left-leaning South Koreans have a naive view of their Northern cousins. News flash: North Korea is a time travel to Chosun Dynasty gone horribly wrong, nothing to do with communism. Some actually believe South Korea is under worse condition because of Uncle Sam that saved the country just as they were about to get overrun by Kim Il Sung, than under Japanese Imperial rule because of "democracy and freedom". I invite these people to defect to the North, and see why there's streams of North Koreans going the other way and staring at you like you are crazy.
Vive la revolucion!