We are in much the same pickle as Roosevelt during the run-up to WWII. He knew that it was enevitable that we would get in the game. However, he also knew that he couldn’t get ahead of the American people as many still had bad memories about being pulled into WWI and thereby did not support being involved in another foreign war. But, Japan handed him a gift by attacking Pearl Harbour as it created outrage and a cry for revenge across the country. Then, a few days after, Hitler handed him another gift by declaring war on the U.S. So, the best we can hope for regarding North Korea is that it will hand us a gift that will provide a clear existential reason to strike North Korea’s leadership, nuclear, and other military/industrial structures and completely destroy their military capability. Hopefully, the causal event will have minimal loss of life. I’m thinking the best we could hope for would be for North Korea to do something really stupid such as fire a neuclear tipped rocket at Japan or South Korea and that it be intercepted and destroyed in mid-flight by one of our missiles. But, we shall see ...
I would say we are pretty used for Foreign entanglements. Convincing most Americans that we have to go to war is actually pretty easy.