Some retaliated by protesting with pitchforks and fire<span />
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He embarked on a mission to unite all Germanic peoples into one kingdom, and convert his subjects to Christianity. A skilled military strategist, he spent much of his reign engaged in warfare in order to accomplish his goals. In 800, Pope Leo III (750-816) crowned Charlemagne emperor of the Romans.
Explanation:
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Cars became popular in 20th century. I think this is the right answer.
