Answer :
Final answer:
Tiburcio knows Don Andres Pico as a trustworthy ally due to their service together in the Mexican-American war.
Explanation:
Tiburcio knows Don Andres Pico as a trustworthy ally because they served together in the Mexican-American war. Their shared experience in the war solidified their bond and trust in each other, making Pico a reliable ally for Tiburcio.
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