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The United States dropped an atomic bomb on Hiroshima on August 6,1945. 

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The United States dropped an atomic bomb on Hiroshima on August 6,1945. 

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The U.S. didn't tell the Soviet Union that they planned on dropping an atomic bomb on Hiroshima on August 6,1945. When the bomb was dropped, approximately 80,000 people were killed as a direct result of the blast, and another 35,000 were injured. The bomb-dropping may have ended World War 2, but some believe it started the Cold War.

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In 1949,the Soviets tested their own atomic bomb, and then the Cold war nuclear race was on.

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In 1949,the Soviets tested their own atomic bomb, and then the Cold war nuclear race was on.

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the Arms Race rose to a terrifying level after both the U.S. and the Soviet Union tested their first intercontinental ballistic missiles in 1952. 

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the Arms Race rose to a terrifying level after both the U.S. and the Soviet Union tested their first intercontinental ballistic missiles in 1952. 

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in 1953,the Americans tested their first hydrogen bomb. The soviets did the same a year later.

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in 1953,the Americans tested their first hydrogen bomb. The soviets did the same a year later.

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After the Soviet Union created their first successful atomic bomb, the United States decided to do the same. They developed the next stage in atomic weaponry, which would be the hydrogen bomb. This new weapon was 1,000 times more powerful than conventional nuclear devices. This lead to many other nations creating even more powerful nuclear bombs and the Arms Race had taken a fearful step forward.

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On October 4, 1957, the Soviets sent the first satellite, Sputnik,  into space. 

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On October 4, 1957, the Soviets sent the first satellite, Sputnik,  into space. 

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The U.S. then created the National Aeronautics and Space Administration (NASA) and launched their own satellite in 1958. This would begin the U.S.-U.S.S.R space race.

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Soviets launched the first dog (Laika) into space in 1957.

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Soviets launched the first dog (Laika) into space in 1957.

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Sputnik 2,launched on November 3,1957, carried the dog Laika. Laika was the first living creature to be shot into space and orbit Earth. Laika was a stray dog that was found on the streets of Moscow. She only lived a few hours in orbit.

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Britain,Israel,France and China began to develop nuclear weapons in the 1950's and 1960's. Many other countries also began to make weapons.

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Britain,Israel,France and China began to develop nuclear weapons in the 1950's and 1960's. Many other countries also began to make weapons.

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The British join in on the nuclear battle

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In 1962, the Soviet Union began secretly installing missiles in Cuba. 

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In 1962, the Soviet Union began secretly installing missiles in Cuba. 

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In 1962, a nuclear war almost broke out when the Soviets implemented a secret agreement to place Soviet warheads in Cuba. The Soviet Union had installed nuclear missiles in Cuba, only 90 miles from the coast of Florida. The U.S. then demanded that the Soviet Union remove the bases and any nuclear weapons. This began the Missile Crisis standoff.

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The crisis ended in a compromise when Khrushchev removed the missiles from Cuba and Kennedy agreed to not invade Cuba. 

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The crisis ended in a compromise when Khrushchev removed the missiles from Cuba and Kennedy agreed to not invade Cuba. 

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Even though the crisis ended in a compromise, this event still alerted the world about the danger of the arms race.

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In 1968, the nuclear powers signed the Treaty on the Non-Proliferation of Nuclear Weapons. This treaty would prevent the spread of nuclear weapons technology to new countries. 

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In 1968, the nuclear powers signed the Treaty on the Non-Proliferation of Nuclear Weapons. This treaty would prevent the spread of nuclear weapons technology to new countries. 

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As of 2 years ago, in 2020, 190 countries are a part of the treaty.

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The START 1 treaty in 1991 aimed to further reduce both the U.S. and the USSR's ballistic weapons capabilities.

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The START 1 treaty in 1991 aimed to further reduce both the U.S. and the USSR's ballistic weapons capabilities.

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The START 1 treaty was signed on July 31,1991 by President George H.W Bush and Soviet President Mikhail Gorbachev. The treaty limited the number of Intercontinental Ballistic Missiles and nuclear warheads either country could possess.

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Cold War ended in 1991 but in 1987 the U.S. and the Soviet Union had signed the intermediate-Range Nuclear Forces Treaty (INF) to limit the scope and reach of all types of missiles. 

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Cold War ended in 1991 but in 1987 the U.S. and the Soviet Union had signed the intermediate-Range Nuclear Forces Treaty (INF) to limit the scope and reach of all types of missiles. 