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. POPULATION 
Clue: Between 2000 & 2010 these 2 states that border each other led the nation in highest percentage of population increase, 35% & 25%
arizona and nevada

Category: U.S. PRESIDENTS 
Clue: The last names of 8 different presidents end with this 3-letter combination
son

Category: STATE CAPITALS 
Clue: This Southern capital was named for an ancestor of a 20th century poet known for his clever rhymes

nashville, tennessee