32 33. Franklin D.Roosevelt 1933-1945 Harry S.Truman 1945-1 1942-1946:The Manhattan Project 1942:The Operation Torch in Africa 1942:The Battle of Midway 1944:The Battle of Leyte Gulf 1945-1953:Harry S.Truman as the 33rd President ·1945:The Battle of Okinawa(冲绳)in April 1945:The Charter of the United Nations 1945:Little Boy (Uranium)Dropped on Hiroshima 1945:Fat Man (Plutonium)Dropped on NagasakiChronological Landmarks In USA • 1933–1945: FDR as the 32nd President • 1941: The Lend–Lease Act in March • 1941: Pearl Harbor Attack on Dec 7; U.S. in WW II • 1942–1946: The Manhattan Project • 1942: The Operation Torch in Africa • 1942: The Battle of Midway • 1944: The Battle of Leyte Gulf • 1945–1953: Harry S. Truman as the 33rd President • 1945: The Battle of Okinawa(冲绳 ) in April • 1945: The Charter of the United Nations • 1945: Little Boy (Uranium) Dropped on Hiroshima • 1945: Fat Man (Plutonium) Dropped on Nagasaki