What planned Allied invasion operation would have attacked Japan's home islands in late 1945?

Operation Downfall was the planned Allied invasion of Japan's home islands in late 1945 and 1946. It was never carried out because Japan surrendered before the operation began.

Downfall consisted of two major stages. Operation Olympic was scheduled to land on Kyushu on November 1, 1945, while Operation Coronet was planned for Honshu near Tokyo on March 1, 1946. Allied planners expected fierce resistance, drawing on the costly Battle of Okinawa and Japan's preparations to defend the home islands.

Operation Overlord was a separate Allied plan for the 1944 invasion of German-occupied Normandy, so it is not the correct answer. The atomic bombings of Hiroshima and Nagasaki, the Soviet declaration of war, Japan's military situation, and internal political decisions all formed part of the complex context surrounding surrender. Because Downfall remained a plan rather than an executed campaign, casualty estimates vary considerably among historical sources.