what did presidents roosevelt and truman both believe about the bomb from the beginning?\nthat it was too…

Brief Explanations:

Both Roosevelt and Truman saw the atomic bomb as a tool that could be used strategically. Roosevelt was involved in the early stages of the bomb's development during World War II. Truman, who took over after Roosevelt's death, made the decision to use the bomb. Their belief was centered around the idea of using it to achieve certain war - related goals, such as shortening the war (in the case of Japan's continued resistance) and saving American lives (by avoiding a costly invasion of Japan). The first option about it being too powerful except as a final resource doesn't fully capture their proactive stance towards using it for war - ending purposes. The third option about it being a reminder to all nations is more of a secondary or long - term perception rather than the initial belief about its use in the war context.

Answer:

that it should be used if it would shorten the war or save American lives