I’ve said this before and I’ll say it again.
Truman should have listened to MacArthur instead of firing him.
A few megatons over Beijing and Shanghai in 1946 would have solved that problem once and for all.
Actually, MacArthur's plan was far less extreme. He proposed only nuking the area along the Yalu River and North Korean border so the Red Chinese couldn't reinforce or supply the North Koreans.
We alone had nuclear weapons at the time. MacArthur was a thoroughly decent human being who believed in minimum casualties. He was proud of retaking the Pacific with fewer casualties that Mark Clark lost taking Anzio Beach.
MacArthur's speech "Duty, Honor, Country" ought to be required reading for every school child in America.