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: U.S. STATES 
Clue: With over 35,000 miles, this state has the longest highway system in the U.S.
texas

Category: ORGANIZATIONS 
Clue: It moved its HQ from Savannah to Wash. D.C. in 1913, & in 1917 began making each First Lady honorary pres.
the girl scouts of the u.s.a.

Category: U.S. PRESIDENTS 
Clue: You have to go back over a century to find him, the last president who never had a vice president

chester arthur