During the Meiji period, Nagasaki became a center of heavy industry. Its main industry was ship-building, with the dockyards under control of Mitsubishi Heavy Industries becoming one of the prime contractors for the Imperial Japanese Navy, and with Nagasaki harbor used as an anchorage under the control of nearby Sasebo Naval District. During World War II, at the time of the nuclear attack, Nagasaki was an important industrial city, containing both plants of the Mitsubishi Steel and Arms Works, the Akunoura Engine Works, Mitsubishi Arms Plant, Mitsubishi Electric Shipyards, Mitsubishi Steel and Arms Works, Mitsubishi-Urakami Ordnance Works, several other small factories, and most of the ports storage and trans-shipment facilities, which employed about 90% of the city's labor force, and accounted for 90% of the city's industry. These connections with the Japanese war effort made Nagasaki a major target for strategic bombing by the Allies during the war.
During the Meiji period Nagasaki became a center of heavy industry Its main industry was ship-building with the dockyards under control of Mitsubishi Heavy Industries becoming one of the prime contractors for the Imperial Japanese Navy and with Nagasaki harbor used as an anchorage under the control of nearby Sasebo Naval District During World War II at the time of the nuclear attack Nagasaki was an important industrial city containing both plants of the Mitsubishi Steel and Arms Works the Akunoura Engine Works Mitsubishi Arms Plant Mitsubishi Electric Shipyards Mitsubishi Steel and Arms Works Mitsubishi-Urakami Ordnance Works several other small factories and most of the ports storage and trans-shipment facilities which employed about 90% of the city's labor force and accounted for 90% of the city's industry These connections with the Japanese war effort made Nagasaki a major target for strategic bombing by the Allies during the war