He was 33rd President of the United States, taking over after the death of Franklin Roosevelt, and was responsible for giving the orders to drop the atomic bomb on Hiroshima in 1945

Harry Truman.

Explanation:

President Harry Truman (1884-1972) became the 33rd president of the USA after the death of president Franklin Delano Roosevelt. He left a significant political and historic legacy. Truman made the decision to throw the atomic bomb on Japan,  he led the efforts of Europe´s reconstruction, he was the first Cold War US leader. He promoted the doctrine of Soviet containment and got the US into the Korean War.

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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four sitting presidents have been assassinated while in office but the first was abraham lincoln,