Bombing Hiroshima and Nagasaki was probably the best choice the Americans had to win at world war 2. If Japan didn't unconditionally surrender after the nukes, the United states would have to implement Operation Downfall. Operation Downfall was the proposed Allied plan for the invasion of the Japanese Home Islands near the end of World War II. If the Americans did this, the world would have changed, splitting Japan like how the Allies did with Germany, splitting some with the Republic of China, Great Britain, The United States and the Soviet Union. If the Americans conducted the invasion, there would be hundreds of thousands of more casualties maybe even crossing one million. I think with this statement alone, Nuking Japan was probably the best option the Allies had.