The impact of the Korean War on the civilian population was especially dramatic. Korean civilian casualties - dead, wounded and missing - totalled between three and four million during the three years of war (1950-1953). The war was disastrous for all of Korea, destroying most of its industry.
Because if you look at human migration. We came from Africa went to Europe and the migrated across Asia. Then there was still a land bridge to North America, but then we got trapped over there because our bridge went away.