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: LAW ENFORCEMENT 
Clue: This police force developed from bands of Indian fighters who protected American settlers in Mexico

Answer: the texas rangers


Question: Category: ANCIENT ARTIFACTS 
Clue: Some of its text says, "The decree should be writen on a stela of hard stone, in sacred writing, document writing & Greek writing"

Answer: the rosetta stone


Question: Category: U.S. PRESIDENTS 
Clue: This president was the last surviving signer of the U.S. Constitution

Answer:
james madison