The US Army once ruled Pyongyang and 5 other things you might not know about the Korean War
https://edition.cnn.com/2020/06/24/asia/korean-war-70th-anniversary-intl-hnk/index.html
At least in Japan, it's famous that there was a moment that American troop governed most of the current North Korean territory. But, I was surprised at the fact that all of the bombs used in the war were much more than ones used in World War 2.
And, this is the first time for me to learn that US didn't declare war in Korean War.