Who became U.S. president in 1945?

Which Argentine colonel, jailed and then freed amid mass protests in October 1945, was elected president in 1946? Who won the best actress Oscar for "Mildred Pierce" (1945)? Which 1945 best picture is about a weekend alcoholic binge? Which singer starred in the 1933 film version of Eugene O'Neill's "The Emperor Jones"? The 1945 John Wayne film "Back to Bataan" is set in which country? Which actor directed and starred in a patriotic World War II film of Shakespeare's "Henry V"? Which comedian, known for his drawling "Ah, yes," died in Pasadena on Christmas Day 1946 at age 66? In 1946, an international military tribunal in which city sentenced 12 Nazi leaders to death?