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: U.S. CITIES 
Clue: On May 24, 1844 Samuel Morse was in this city demonstrating his invention

Answer: washington, d.c.


Question: Category: BASEBALL & THE PRESIDENCY 
Clue: As both vice president & president, he threw out a season's 1st pitch, each time for a different Senators franchise

Answer: richard nixon


Question: Category: COUNTRIES OF THE WORLD 
Clue: In 1839 Thomas Buchanan, cousin of a U.S. president, became the first governor of this future country

Answer:
liberia