Final answer:
The atomic bomb dropped on Hiroshima caused immediate and long-term devastation, killing around 140,000 people and contributing to Japan's eventual surrender in World War II.
Step-by-step explanation:
The use of the atomic bomb on Hiroshima had catastrophic effects. On August 6, 1945, the Enola Gay dropped the atomic bomb known as Little Boy on the city. This atomic blast flattened Hiroshima, immediately killing an estimated 70,000 people, with the death toll eventually reaching around 140,000 due to the resultant burns, injuries, and radiation poisoning. The bomb not only leveled the city but also left long-term effects due to radiation exposure. Despite the unprecedented destruction, Japan did not immediately surrender. It wasn't until a second bomb, named Fat Man, was dropped on Nagasaki and the threat of continued bombings that Japan finally surrendered, ending World War II.