Korea was the FIRST "Limited War" (Vietnam was the SECOND) fought during the Cold War. Nuclear Weapons created the Cold War. A "Limited War" was fought with "limitations" on where the war would be fought and using only conventional weapons. Without Nuclear Weapons, the US/Allies would have probably invaded Red China, when Communist China entered the war. Which of course would have caused the Soviet Union to enter the war. Which naturally would have led to WW3. The Soviets tested their first Atomic Weapon in 1949.
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Abdul Qadeer Khan was a Pakistani metallurgical engineer who played a major role in Pakistan's nuclear weapons program. He is credited with leading Pakistan's efforts to develop nuclear technology and successfully conducting nuclear tests in 1998. However, he was also involved in nuclear proliferation activities by sharing nuclear technology with other countries, leading to international controversy and sanctions.
Two were dropped on Japan, which gave them an excuse to end the war quickly without losing face.
Atomic weapons played a major role in fear, but were never actually used in the Cold War. There were multiple instances in which the Soviet Union and United States threatened each other with atomic weapons, such as the Cuban Missile Crisis, but overall no Atomic weapons were ever used on enemy countries which is how the Cold War stayed cold.
Jingoism
Both the Union and the Confederacy had access to a range of weapons during the American Civil War. The Union had better industrial resources and was able to produce more advanced weapons such as rifled muskets and artillery. However, the Confederacy had skilled marksmen and resourcefulness in making use of captured weapons. Ultimately, the Union's superior industrial capacity and arsenal played a significant role in its victory.