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American scientists conclude that plutonium can be used as a weapon in the form of a bomb. The president was interested in using the plutonium once it was successful.
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President Roosevelt authorizes the Manhattan Project to develop atomic weapons which are deadlier than plutonium.
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Japanese forces attack the Unites States Naval base at Pearl Harbor, Hawaii, thus bringing the United States into World War Two.
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Construction of the bombs begins on The Hanford Site, in Washington State.
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The first batch of plutonium from Hanford's reactors is ready for testing.
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The first batch of Uranium-235 is successfully separated at Oak Ridge National Laboratory in Tennessee.
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President Franklin D. Roosevelt dies. Vice-President, Harry S Truman, becomes the 33rd President of the United States. Truman spent his first couple of weeks as President completely unaware of the atom bombs currently in development.
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There was a meeting held to determine which Japanese city was the perfect place to drop the bomb.
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The U.S wanted Japan to surrender, at the time Japan did not know the atomic bomb was ready, so they responded with silence.
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Commanded by Colonel Paul Tibbets, drops a 15 kiloton atomic bomb nicknamed Little Boy over the Japanese city of Hiroshima. Approximately 130,000 people died in the explosion and the immediate after-effects of the attack.
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Commanded by Major Charles Sweeney, dropped a 21 kiloton atomic bomb on the Japanese city of Nagasaki.
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The Japanese decided to surrender to the U.S with a plan of war in mind.