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: U.S. GEOGRAPHY 
Clue: Of the USA's 50 tallest peaks, all are in Alaska, Colorado & California except this peak

SOLUTION: mt. rainier

PROBLEM: Category: WORLD HISTORY 
Clue: City that was the seat of government of the viceroyalty of New Spain

SOLUTION: mexico city

PROBLEM: Category: WORDS IN LITERATURE 
Clue: In Webster's, it means either a soldier using a certain muzzle-loading weapon, or a boon companion

SOLUTION:
musketeer