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Why was Nagasaki selected as a target for an atomic bomb?

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Atomic bombing of Hiroshima — atomic bombings of Hiroshima and Nagasaki A gigantic mushroom cloud rising above Hiroshima, Japan, on August 6, 1945, after a U.S. aircraft dropped an atomic bomb on the city, immediately killing more than 70,000 people.

Nagasaki was selected as a target for the second atomic bomb primarily due to its status as a major shipbuilding center in the early 20th century.12

While Nagasaki was designated as a target, it was not the primary objective for the mission on August 9, 1945. The B-29 bomber Bockscar was originally dispatched to attack the city of Kokura. However, after spending 45 minutes over Kokura, the crew was unable to sight the designated aim point due to thick clouds and haze. Faced with diminishing fuel reserves and concerns regarding Japanese antiaircraft defenses, the mission commander decided to proceed to the secondary target, Nagasaki.342

It is important to note that Nagasaki was added to the target list after Kyoto was removed from consideration due to its cultural significance. Although Nagasaki was chosen for its industrial importance, its geography—characterized by two coastal valleys separated by hills—made it a less ideal target than Hiroshima, as the uneven terrain served to shield parts of the city from the full force of the blast.532