Every two years North Korea makes some outrageous new threat. Their goal is to get food or something else they need. They do this once and we all talk about it for a few days. Two years later, they do it again and we talk about it as if it has never happened before. As a nation, the US has the memory of a gnat.
If N Korea did start a World War III, they would have enough money and resources to keep the war going for about 1 month.