"Destruction was particularly acute in the North, which was subjected to years of American bombing, including with napalm. Roughly 25 percent of its prewar population was killed, Professor Cumings said, and many of the survivors lived underground by the war’s end. “North Korea was flattened,” he said. “The North Koreans see the American bombing as a Holocaust, and every child is taught about it.” Damage was also widespread in South Korea, where Seoul changed hands four times. But most combat took place in the northern or central parts of the peninsula around the current Demilitarized Zone, which divides the countries, Professor Cumings said."