President Truman announced to the people of America that they successfully developed a hydrogen bomb.
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The Soviet R-7 Semyorka, the world's first Intercontinental ballistic missile, became operational.
Machine guns were fired from a US airplane for the first time.
Colombia's militant group FARC agreed to lay down their weapons after 52 years of guerilla warfare.
British Prime Minister Winston Churchill went public that Britain had its first atomic bomb and planned to test it in Australia by the end of the year.
Citizens of Bikini Island evacuated for nuclear testing.
