With the Potsdam Declaration, the Allies told Japan to “Surrender or Else!” The Japanese mocked “Or Else WHAT!” The First Else was delivered at HIroshima. Japan still refused to surrender, so the Second Else was delivered to Nagasaki at 1102 hours Japan Standard Time on August 9, 1945:

As it turns out, this was was the Secondary Target. Kokura and Niigata are quite likely very thankful they were spared.