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: ISLAND NATIONS 
Clue: It's where the mambo originated
cuba

Category: ART 
Clue: Medieval artists gave triangular ones to the trinity, round to the angels & rectangular to living holy people
halos

Category: U.S. HISTORY 
Clue: In 1790 Philadelphia replaced this city as the new capital of the U.S.

new york city