Which three Allied powers issued the Potsdam Declaration demanding Japan's surrender in July 1945?

The United States, United Kingdom, and China issued the Potsdam Declaration demanding Japan’s surrender in July 1945.

The declaration was released on July 26, during the Potsdam Conference in Germany. It called for the unconditional surrender of Japan’s armed forces and warned that the alternative would be “prompt and utter destruction.” The Soviet Union did not sign because it was not yet at war with Japan when the declaration was issued.

The signatories were represented by U.S. President Harry Truman, British Prime Minister Winston Churchill, and Chinese leader Chiang Kai-shek. Churchill was replaced by Clement Attlee as Britain’s representative after the British election, but the declaration had already been issued under Churchill’s name.

Japan initially rejected the declaration publicly, but later accepted its terms after the atomic bombings, the Soviet entry into the war, and internal political deliberations. Emperor Hirohito’s August 15 broadcast announced acceptance; the September 2 ceremony completed the formal surrender.