system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why did the US specifically target Hiroshima and Nagasaki with nuclear weapons?

Ok, essentially the US hit Japan to force them to give up the war but why were Hiroshima and Nagasaki specifically targeted? Did they hold any strategic significance or was the US basically trying to cause as many casualties as possible?
gpt
Nagasaki was the original primary target but was hidden by cloud cover on August 6, 1949, so Hiroshima (the secondary target) was used. 

Nagasaki and Hiroshima were chosen due to thier military value. During World War II, the 2nd General Army and Chugoku Regional Army were headquartered in Hiroshima, and the Army Marine Headquarters was located at Ujina port. The city also had large depots of military supplies, and was a key center for shipping.

 Nagasaki was 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.