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: EXPLORERS 
Clue: John Speke died just before he was to debate this former exploring partner on the source of the Nile

SOLUTION: sir richard burton

PROBLEM: Category: WISCONSIN PLACES 
Clue: The overalls seen here were made by a company that was founded in this city in 1895

SOLUTION: oshkosh

PROBLEM: Category: THE CIVIL WAR 
Clue: Clement Valandingham was the leader of this group of Northerners opposed to the war

SOLUTION:
copperheads