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: WORLD GEOGRAPHY 
Clue: The world's highest city of over 1 million people sits at about 12,000 feet in these mountains

Answer: the andes


Question: Category: U.S. HISTORY 
Clue: The day affer the 15th Amendment took effect, Thomas Peterson became the 1st Afr. American to do this under its provisions

Answer: vote


Question: Category: 19th CENTURY AMERICA 
Clue: This politician died on June 3, 1861, 39 days after giving a speech in Springfield, Illinois supporting the Union

Answer:
stephen douglas