13. Harry Truman
Truman first served as Vice President to Franklin Roosevelt and became President after Roosevelt died on April 12, 1945. As President, he made some of the most important decisions in American history.
He pleaded with Japan to surrender in the waning months of World War II, but they refused. He made the monumental decision to drop atomic bombs on two of their most war-centric cities, Hiroshima and Nagasaki. Japan quickly surrendered after that.
He also is best known for proposing the “Fair Deal” which advocated for the expansion of Social Security, fair employment practices, and public housing.