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: THE CIVIL WAR 
Clue: A century before the U.S.S. Nautilus, the Confederacy had 2 of these new ships, the Pioneer  & the Hunley
submarines

Category: "HOUSE" MUSIC 
Clue: This song was a hit for John Mellencamp in 1984: ain't that America?
"pink houses"

Category: "EAU" YEAH! 
Clue: A gracious gesture, or a 1939 Gary Cooper film about 3 brothers serving in the Foreign Legion

beau geste