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 consistency, answers should be in all lower cased letters.
PROBLEM: Category: U.S. CITY NICKNAMES 
Clue: Among the sobriquets used for this city are "Witchcraft City" & the "Paradise of New England"

SOLUTION: salem, massachusetts

PROBLEM: Category: ENGINEERING 
Clue: The motto of this 1904-1914 engineering project was "The land divided, the world united"

SOLUTION: the panama canal

PROBLEM: Category: DR. SEUSS CHARACTERS 
Clue: This turtle was king of the pond at the island of Sala-ma-Sond

SOLUTION:
yertle the turtle