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 consistency, answers should be in all lower cased letters.
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Question: Category: ENGINEERING 
Clue: The motto of this 1904-1914 engineering project was "The land divided, the world united"

Answer: the panama canal


Question: Category: POTPOURRI 
Clue: Country in which you'd find the Book of Kells

Answer: ireland


Question: Category: "HAT" CHECK 
Clue: Legendary feudin' enemies of the McCoys

Answer:
the hatfields