Why did the United States drop an atomic bomb on Hiroshima, Japan?

Lz didn't ask clearly. Do you want to know "why the atomic bomb was dropped" or "why in Hiroshima"?

Why drop an atomic bomb:

1. The American army suffered from Japanese suicide crazy resistance in Iwo Jima and Okinawa, and suffered heavy losses, so it hoped to avoid more casualties and directly forced Japan to surrender.

2. The United States hopes to end the war quickly, realize unilateral control over Japan before the intervention of Soviet troops, and then contain the Soviet Union.

After all, the atomic bomb has to be tested in actual combat …

Why in Hiroshima:

1. The US military hopes that the target city will have a certain scale, but it cannot be an overly important city like Tokyo.

2. In order to avoid the destruction of ancient cities such as Nara in Kyoto, the target city had better not have too much historical value.

3. In order to observe the attack effect of the atomic bomb, the weather should be clear and the visibility should be good during the air raid, and the weather in Hiroshima was just fine that day (later, the US military bombed the warehouse because of the bad weather and temporarily changed it to bombing Nagasaki).

This is all I can think of. ...