: He was a major African American civil rights leader in the late 19th century through the first half of the 20th century. He was an author, historian, and a co-founder of the NAACP in 1909.

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explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.