The intensifying war of words between North Korea, the United States and ally South Korea could ignite a major conflict. The likely trigger would be a small clash at sea, in the air, or along the Demilitarized Zone dividing the two Koreas.
What would a war in Korea look like?
First, nuclear conflict is unlikely. North Korea is not believed to have any long or medium-ranged nuclear weapons, certainly none that could hit North America. North Korea might be able to strike South Korea with a nuclear device. But then US nuclear weapons would wipe North Korea off the map.