The United States conducted its first and only nuclear artillery test at the Nevada Test Site.
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North Korea tested its first intercontinental ballistic missile (ICBM).
The world's first atomic bomb was detonated.
The Outer Space Treaty was signed to prevent the use of nuclear weapons being utilized in space.
US President Franklin D. Roosevelt received a letter from Albert Einstein detailing the possibility of atomic weapons.
The Soviet Union started mass producing the AK-47 assault rifle.
