President Harry S. Truman was the 33rd president of the United States, taking the office after late Franklin D, Roosevelt. Truman assumed the presidency during the Second World War and gave an order to drop the first atomic bomb attack. After it appeared that Japan won’t capitulate, Truman ordered first atomic attack on Hiroshima (August 6th in 1945) and the second on Nagasaki (August 9th in 1945) resulting in 214.000 people dying.