Answer:
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Answer: The Monroe Doctrine is the best known U.S. policy toward the Western Hemisphere. Buried in a routine annual message delivered to Congress by President James Monroe in December 1823, the doctrine warns European nations that the United States would not tolerate further colonization or puppet monarchs.
Historians look for causes and effects that help to explain how and why events happened.
Answer:
Nomads
Explanation: Nomads were the earliest humans from Africa, while hunter-gatherers developed during the Neolithic era.