The Manhattan project had both positive and negative effects. The significance of the Manhattan Project was to WWII by using weapons of mass destruction and forced Japan to surrender. President Harry S. Truman made a decision On August 6, 1945, to drop a bomb over the Japanese city of Hiroshima he wanted to end the war quickly which was good but at what cost. all the scientist that contributed to the formation of nuclear weapons were motivated by the threat of the Nazis making an atomic weapon, but they all regretted their part and wanted to change the course of history. They believed that scientists had an important role to play in educating the general population about nuclear threats and encouraging the public and political leaders to support
