Peeking at the Past: Hypothetical Scenario: U.S. drops the Bomb, Russia declares war, but Japan doesn't surrender?
If Japan had not surrendered after the double whammy of the Hiroshima/Nagasaki A-bomb attacks and the entry of the Soviet Union into the Pacific War, it is likely that: The 20th Air Force would have resumed its massive conventional bombing campaign against Japan’s cities (including Kyoto) until several atomic bombs became available in 1945 and 1946. (I believe a third A-bomb could have been dropped sometime after August 15, 1945 had the Japanese not agreed to surrender on that day.) The invasion of Kyushu, codenamed Olympic, would have been carried out on or around November 1, 1945. According to Alfred Coppel’s The Burning Mountain: A Novel of the Invasion of Japan, which was based on the actual American and Japanese war plans for the invasion, the Allied objective was to capture only enough of Kyushu to establish a series of naval and air bases there. These bases would then be used as part of the infrastructure for Operation Coronet, the invasion of Honshu. (Richard B. Frank