From simple Googling: “Even if we hadn’t of dropped the atomic bomb, Hiroshima and Nagasaki would still have been targets for attack. This is because Hiroshima was a large industrial city that contained the 2nd Japanese Army Headquarters, which was in charge of all the defense systems in Southern Japan; Hiroshima also had communication centers for armies, storage points, and troop assemblies. Small industial plants were also in the outskirts of the city. As for Nagasaki, it was the largest fully operational sea port in Southern Japan, which produced ships, equipment, and relief supplies. There is much other information that can be explained about the reality of dropping the bomb on Japan and this was one ‘chunk’ of information.”