I want to know the answer to the following question:
What ultimatum stated that Japan would face "prompt and utter destruction" if it did not surrender?
All the background I'm provided with is that "On 26 July 1945, the President of the United States Harry S. Truman, the President of the Nationalist Government of China Chiang Kai-shek and the Prime Minister of Great Britain Winston Churchill issued the Potsdam Declaration, which outlined the terms of surrender for the Empire of Japan as agreed upon at the Potsdam Conference.". Is that enough to answer the question?
Answer: yes