A reliable source is one that provides a thorough, well-reasoned theory, argument, discussion, etc. based on strong evidence. Scholarly, peer-reviewed articles or books -written by researchers for students and researchers. Original research, extensive bibliography.
<span> a traditional scandinavian story form called SAGAS.</span>
You're answer is going to be C. "The Red Scare".
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It was a long and bloody struggle among several factions in constantly shifting alliances which resulted ultimately in the end of the 30-year dictatorship in Mexico and the establishment of a constitutional republic.