World War II begins.
President Franklin D. Roosevelt approves the development of the atomic bomb, the worlds first nuclear weapon.
The United States government research project in which is responsible for having produced the worlds first atomic bombs is known as the Manhattan Project.
Japan launched a surprise attack among Unites states soil attacking Pearl Harbor, Hawaii.
At the University of Chicago Enrico Fermi created the worlds first controlled nuclear fission reaction
The primary target for the dropping of the worlds first two atomic bombs was chosen as the country of Japan after the recent surprise attack on Pearl Harbor. The target was chosen by the Military Policy Committee of the Manhattan Project.
Franklin D. Roosevelt dies of a brain hemorrhage. Following his death Harry Truman is named as the 33rd President of the United States of America.
The Manhattan Project Target Committee select Kyoto, Hiroshima, Kokura, and Niigata, as possible targets to use the atomic bombs on.
Germany agrees to an unconditional surrender.
A petition was started by Leo Szilard to get Harry Truman, president of the United States to call off the plan to use the atomic bomb on Japan.
In Los Alamos, New Mexico the first atomic bomb was tested at the Trinity site.
The Potsdam Declaration was issued, asking for the unconditional surrender of Japan, however Japan refused.
Three days after the bombing of Hiroshima, the worlds second ever nuclear weapon was dropped on the Japanese city of Nagasaki.
Final targets for the detonation of the first two atomic bombs was chosen as the Japanese cities of Hiroshima and Kokura.
The worlds first uranium bomb was detonated over the Japanese city of Hiroshima.
Three days after the United states dropped the first bomb on Hiroshima, President Truman addresses the nation in a radio address.
Japan formally surrenders having agreed to the allies terms of surrender. Thus bringing WWII to a close.
The aftermath of Hiroshima and Nagasaki was devastating.
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