Japan and atomic bomb.

During World War II, the United States dropped two atomic bombs on Japan. The first bomb, codenamed "Little Boy," was dropped on Hiroshima on August 6, 1945. The second bomb, codenamed "Fat Man," was dropped on Nagasaki on August 9, 1945. These bombings resulted in massive casualties and widespread destruction, leading to Japan's surrender and the end of World War II. The bombings remain controversial and are remembered as tragic events in history.