Why did the US military choose Hiroshima, Nagasaki, Kokura and Niigata to drop atomic bombs on Japan during World War II? What's special about it?

Hiroshima, Kokura and Niigata were all important industrial cities in Japan at that time, and the flat terrain was convenient for bombs to exert their power.

Hiroshima had the largest naval academy in Japan at that time-Jiangtian Island Naval Academy, and it was also the headquarters of the Second Military Region of the Japanese army and the largest assembly place of the Japanese army. Uta port in Hiroshima was the main port of Japanese maritime transportation line at that time.

Kokura owned the largest arsenal in Japan at that time, and Niigata was an important center of heavy industry in steel, oil refining and ironmaking.

As for Nagasaki ... Nagasaki has Mitsubishi Heavy Industries' Nagasaki Shipyard, which can be regarded as a second-line target. It was chosen because of a series of coincidences.

First of all, Kyoto, which was originally the first target, was cancelled due to the strong opposition of henry lewis stimson, then US Secretary of the Army. Secondly, after the Hiroshima bombing, the Japanese base camp consistently delayed the decision, which led to the US military's decision to bomb again. Then, on the day when the second atomic bomb was dropped, the warehouse as the first target had bad weather and low visibility. Finally Nagasaki was bombed. ....