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What world-changing weapon was developed during World War II?

Retry Correct Incorrect Although chemical weapons were a horrifying facet of warfare during World War I, the work of the infamous Manhattan Project led to the development of nuclear weapons that leveled the Japanese cities of Hiroshima and Nagasaki in 1945. Although this would mark the only time such weapons were used in war, the threat of them would define the Cold War that followed.

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Universal History Archive/Universal Images Group via Getty Images

Universal History Archive/Universal Images Group via Getty Images

What world-changing weapon was developed during World War II?

• Nuclear weapons
• Chemical weapons
• Biological weapons
• Heat-seeking missiles