Why did the United States drop a nuclear warhead on Hiroshima?

The first thing to decide is the bombing target of the atomic bomb. The military and the State Council have jointly put forward a 17 target list, including Tokyo, Kyoto, Yokohama, Nagoya, Osaka, Kobe, Hiroshima, Ogura, Fukuoka, Nagasaki, Niigata and sasebo. "The selected target shall meet the following conditions. The United States believes that if these places are bombed, it will most seriously affect the fighting will of the Japanese. These targets should be military, or have important headquarters, or the concentration of troops, or the supply and production center of military equipment. In order to accurately estimate the effect of atomic bombs, these targets should not be destroyed by air strikes. But in fact, such targets have rarely been attacked by air before. Some targets were not bombed on a large scale because the Japanese army set up allied prison camps in or near cities, and the United States lacked accurate information in this regard. Every day of the war, our price is heavy. Therefore, other issues are secondary, and there is no energy to think too much about prisoners of war. Finally, the delegates finally decided on three principles: first, the target size must be more than 3 miles in Fiona Fang, and there are important targets; Second, it must be effectively destroyed by the shock wave of the atomic bomb; Third, it is unlikely to be bombed by the air force before August. The recorder's pen mercilessly circled Hiroshima, Ogura, Niigata and Nagasaki. Hiroshima is an important military base and port of departure, and there are several important Japanese arsenals in Kokura ..... and these four cities have not suffered large-scale damage.

Of course, the weather on the day of bombing is also very important. On the day of the bombing, the visibility over Hiroshima was good, the cloud coverage rate was less than 30%, no enemy fighters were intercepted in the reconnaissance, and the anti-aircraft guns were weak. It is suggested that Hiroshima be given priority. Later, the planes that went to Kokura and Nagasaki for reconnaissance also sent back weather reports one after another: the weather above the target was in good condition and could be airdropped. Pilot Tibbets thought for a moment and decided to bomb Hiroshima. And sent a telegram back to the base: decided to bomb 1 target.