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: HIGHWAYS & BYWAYS 
Clue: On Dec. 7, 1995 this state officially renamed its portion of Interstate 10 as the Pearl Harbor Memorial Highway

SOLUTION: arizona

PROBLEM: Category: U.S. MILITARY HISTORY 
Clue: This general commanded the first official American force to fight on the European continent

SOLUTION: john pershing

PROBLEM: Category: -OLOGIES 
Clue: In 1908 Hermann Ebbinghaus said this field "has a long past, but only a short history"

SOLUTION:
psychology