Manhattan Project is founded

Warning of possibility of atomic weapons being produced by Germany

Predecessor of the Manhattan Project, led by Arthur Compton

The roadmap for use of fission to make a bomb

Plutonium is discovered, a superior fission material

opposed use of the bomb against cities due to humanitarian concerns, because Japan was so close to surrender

Led to the beginning of World War II in Europe

determined that the only proper procedure was to use the bomb against a military target

Japanese asked for peace

written by a panel of scientists from the University of Chicago

Bombing of Hiroshima

Truman speech calls Hiroshima a military base, urges Japanese to flee their cities

67 Manhattan Project scientists petition for adequate demonstration and disclosure of the bomb before using it

Bombing of Nagasaki

successful test of the atomic bomb held at Alamogordo, New Mexico