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: "GRAND" PRIX 
Clue: This 3-word nickname for the Republicans dates from the 1870s
grand old party

Category: FAMOUS AMERICANS 
Clue: He once promised, "As long as there is imagination left in the world" his theme park would never be completed
walt disney

Category: STRONG WORDS 
Clue: From the Latin for "energy" or "force" comes this word sometimes paired with vim

vigor