3. The USA almost used nuclear weapons against the Chinese to end the
Korean war, President Truman did not want to start WW3 so instead he got
the world to assist us in ending the Korean war. Why was using nuclear
weapons avoided at this time and since? What would happen if one country
launched nuclear missiles against its enemies? What would the world look
like after a full scale nuclear war?

It greatly damaged the world atmosphere.

Explanation:

Nuclear  weapons avoided at the time of Korean war and since because it greatly damaged the world atmosphere. If one country  launched nuclear missiles against its enemies, it leads to destruction of everything comes in its radius. The world experience firestorms, a nuclear winter, widespread radiation sickness occurs after a full scale nuclear war due to emission of radiations.

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not sure but thinking i'ts cause the government was broke. not sure