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.
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Question: Category: PUBLISHING 
Clue: Founded in 1856, this company introduced a numbering system for U.S. highways in 1917

Answer: rand mcnally


Question: Category: FAMOUS FIRSTS 
Clue: In 1876 this man became the first person not to get a busy signal on the other end of a phone line

Answer: alexander graham bell


Question: Category: THE 17th CENTURY 
Clue: The 1648 Peace of Westphalia ended a war that began on May 23 of this year

Answer:
1618