How did President Truman justify dropping the atomic bomb on Hiroshima and Nagasaki? It was fair retribution for the Japanese attack at Pearl Harbor. It kept the Soviet Union from intervening in Japan It caused the Japanese to withdraw from China. It significantly reduced American casualty rates

President Truman justified the dropping of the atomic bombs on Hiroshima and Nagasaki primarily on the grounds that it would bring a swift end to the war with Japan and save American lives. He believed that a conventional invasion of Japan would result in a prolonged and bloody conflict, with significant American casualties. By using the atomic bomb, Truman aimed to force Japan's surrender and avoid the need for a costly invasion. Additionally, the bombings were seen as a way to demonstrate the United States' military power to the Soviet Union, marking the beginning of the Cold War.