That's what they've been doing for the past 50-odd years isn't it, except without the "powerful" part? They're an economic basket case. All resources go the military while the people starve.
North Korea's best days, such as they were, are behind her. It's all downhill from here.
The loudmouths get all the attention. I for one think the spector of anti Americanism has now somewhat peaked. It was mostly a carnival atmosphere anyway, led by communist students and more than like agents of the North Korean state security apparatus that had infiltrated the south's educational and press system.