The atomic bomb was invented in 1933 by Leo Szilard, but it took the Manhattan Project (1942 to 1947) to actually build the first ones.
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The first atomic bomb was made August 1945. My ? to you is," Why did they even start making those atomic bomb anyway?
It was December 8th 1941 when the US dropped the bombs on Japan.
Japan did not invent the atom bomb. The atomic bomb was first created in the United States in the summer of 1945. The U.S. then used atomic bombs against Japan on august 6 and August 9 of that year. Japan does not have nor did it ever have nuclear weapons.
The US didn't drop bombs on Pearl Harbor. The Japanese bombed Pearl Harbor on December 7, 1941.
It saved millions of Japanese civilian lives that would have been lost in the planned year long invasion of Japan, had the bomb not forced the leaders to surrender.
The two atomic bomb attacks on Japan were in August 1945 (the 6th and 9th, to be exact).