Q: 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. GOVERNMENT 
Clue: On Jan. 1, 1996 this oldest government regulatory agency, established in 1887, closed
A:
the interstate commerce commission