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An introduction to the history of world war two and the manhattan project

However, scientists discovered about that time that a powerful explosion might be possible by splitting an atom. This type of bomb could destroy large cities in a single blast and would change warfare forever.

The Manhattan Project of World War II

The mushroom cloud above Nagasaki, Japan from the atomic bomb Source: US Government Albert Einstein Albert Einstein came up with many of the theories that helped scientists in making the atomic bomb. When he realized that such a bomb could be made, he was frightened about what might happen if Hitler and Germany learned how to make the bomb first.

As a result, Roosevelt set up the Manhattan Project. Manhattan Project The Manhattan Project was the name for the research and development program for the atomic bomb. It started small, but as the bomb became more real, the United States added scientists and funding to be sure they were the first to have the bomb.

Ironically, many of the scientists involved in making the bomb had defected from Germany. The explosion was massive and the equivalent to 18,000 tons of TNT. Although the scientists were happy they had successfully made the bomb, they also were sad and fearful.

  • The project was officially underway by 1941 and headed by U;
  • When he realized that such a bomb could be made, he was frightened about what might happen if Hitler and Germany learned how to make the bomb first;
  • Contemporaneously, the plutonium and implosion based bomb proved to be more effective, and it received its test run on August 9th, 1945 at Nagasaki;
  • When he realized that such a bomb could be made, he was frightened about what might happen if Hitler and Germany learned how to make the bomb first.

This bomb would change the world and could cause mass destruction and death. When President Harry Truman heard of the bomb's success he wrote "We have discovered the most terrible bomb in the history of the world".

  • Hiroshima was chosen because it was a large port city with an army base;
  • Hiroshima was chosen because it was a large port city with an army base.

Japan was defeated as well, but would not surrender. The US was contemplating an invasion of Japan. Army leaders figured that anywhere from 500,000 to 1 million US and Allied soldiers would die in an invasion.

President Truman decided to drop the atomic bomb instead. The explosion was huge, the city was destroyed, and tens of thousands of people were killed. The bomb itself was over 10 feet long and weighed around 10,000 pounds. A small parachute was on the bomb in order to slow its drop and allow the plane time to fly away from the blast zone.

Manhattan Project

The Little Boy atomic bomb Source: National Archives Nagasaki Despite witnessing the terrible destruction of the bomb on Hiroshima, Emperor Hirohito and Japan still refused to surrender. Three days later, on August 9, 1945, another atomic bomb, nicknamed Fat Man, was dropped on Nagasaki, Japan.

Again the devastation was horrible. The Emperor announced this on the radio. It was the first time most Japanese had heard his voice. He is often called the "father of the atomic bomb". The first bomb dropped on Hiroshima was made from uranium.

  • The reactions of different isotopes of uranium were the key experimental factors, although plutonium had just been discovered and testing had begun with that as well;
  • The result was tested at Alamogordo, N;
  • Hiroshima was chosen because it was a large port city with an army base;
  • The Potsdam Conference With the Germans sustaining heavy losses in Europe and nearing surrender, the consensus among U;
  • Three days later, on August 9, 1945, another atomic bomb, nicknamed Fat Man, was dropped on Nagasaki, Japan;
  • Robert Oppenheimer was already working on the concept of nuclear fission along with Edward Teller and others when he was named director of the Los Alamos Laboratory in northern New Mexico in 1943.

The bomb dropped on Nagasaki was made from plutoniumwhich was even more powerful than uranium. It is thought that at least 135,000 people died from the Hiroshima explosion and another 70,000 in Nagasaki. Many of these people were civilians including women and children. Hiroshima was chosen because it was a large port city with an army base.

It also had not been damaged much by earlier bombings. This would show just how powerful the new weapon was. Activities Take a ten question quiz about this page.