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.

Category: 20TH CENTURY AMERICA 
Clue: On April 6, 1917 America entered World War I & this composer wrote "Over There"
george m. cohan

Category: FOLKLORE 
Clue: Old Stormalong soaped his ship to squeeze through the English channel; the soap rubbed off on these cliffs
the cliffs of dover

Category: THE AUTO INDUSTRY 
Clue: GM plans to build Saturn cars in Spring Hill while Nissan has a plant at nearby Smyrna in this state

tennessee