History page 2

After "Fat Man" at Nagasaki.

Little Boy

Fat Man

• Towards the end of World War II, the Allies dropped two atomic bombs on Japan in Hiroshima and Nagasaki. These are the only two times nuclear weapons have been used in a war. 
• After a firebombing campaign that destroyed many Japanese cities, the United States along with the United Kingdom and the Republic of China demanded the surrender of Japan in the Potsdam Declaration on July 26, 1945 under the threat of "prompt and utter destruction"
• Japan ignored the ultimatum, leading to the development of two nuclear weapons by the Manhattan Project
• The Manhattan Project was completed under the direction of Major General General Leslie Groves of the U.S. Army Corps of Engineers
• On August 6, 1945, "Little Boy" was dropped on Hiroshima killing 90,000-166,000 people within the first two to four months of the bombing
• On August 9, 1945, "Fat Man" was dropped on Nagasaki killing 60,000-80,000 people within the first two to four months of the bombing
• About half the deaths in each city occurred on the day of the bombing 
• On August 15, 1945, Japan announced its surrender to the Allies, and signed the Instrument of Surrender on September 2, 1945, officially ending World War II