TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: 20th CENTURY AMERICA 
Clue: Experts say Glenn McDuffie is the mystery man in the classic Eisenstaedt photo taken in this year

SOLUTION: 1945

PROBLEM: Category: CABINET OFFICERS 
Clue: He was the last Secretary of State to serve in the post under 2 presidents

SOLUTION: henry kissinger

PROBLEM: Category: U.S. RIVERS 
Clue: The name of this river, famous in song, may be a corruption of the Spanish for "little Saint John"

SOLUTION:
the swanee