Primary source; if a piece of information, such as an article from 1776, is a primary source because someone was there at the scene. However, a textbook is a secondary source since it extracts information from other sources
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I think its b if I'm wrong I'm sorry.
Explanation:
A powerful ruling class I took this already.
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Civilizations expand through trade, conflict, and exploration. Usually, all three elements must be present for a civilization to grow and remain stable for a long period of time.
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