Because they needed a weapon to defeat the Japanese, and many prestigious scientists, including Einstein himself, mailed the president to tell him of the potential power of an atomic bomb.
he helped us lean about the atomic bomb
Albert Einstein did not create the atomic bomb. The atomic bomb was invented by a group of scientists in the United States. The majority of the research and testing went on at the weapons research and design laboratory at Los Alamos, New Mexico. Einstein did, however, send a letter to president Roosevelt encouraging the United States to begin research on an atomic weapon, and many of Einstein's theories went into the creation of it.The atomic bomb was not invented in the US, it was invented in London, England in 1933 by Leo Szilard and patented by him in 1934. However it took 12 more years, many scientists & engineers & technicians, and an enormous investment in new industrial infrastructure before the first atomic bombs could be built.
when leo szilard invented the neutron chain reaction in 1933 it was used for nothing as it could not yet be built. his 1934 patent on it suggests using it as a more efficient way to transmute elements, other possible uses mentioned were atomic bombs and power reactors.it was not until 12 years later in 1945 after spending 2 billion dollars (mostly on industrial infrastructure) that the US was able to begin building atomic bombs.after testing one atomic bomb on july 16, the next 2 atomic bombs were used as weapons in combat against Japan on august 6 and 9. ending ww2.
US estimates suggest that 4.7 square miles of Hiroshima were destroyed.
The Manhattan Project was lead by Dr. J. Robert Oppenheimer.
He authorized its development by the US.
the us created the atomic bomb
If you consider the US atomic bomb is a Christian bomb, the French atomic bomb is also Christian bomb and so on, then you can name the Pakistani atomic bomb an Islamic bomb.
The US dropped the atomic bomb onto Japan on August 1945.
To defend against a possible Nazi atomic bomb!
The hydrogen bomb.
$250,000,000 a day making war goods
1945
Robert Oppenheimer was the chief scientist of the US development of atomic weapons. Thousands of people worked on the bomb in various capacities
Fear that Nazi Germany might develop it first and use it to take over the world.
Mostly fear that if we didn't do it first the Soviets would. Not much different than the reason the US pushed development of the atomic bomb: fear that if we didn't do it first the Nazis would.
The A-Bomb was invented in 1945.