Du Bois believed social change could be accomplished only through agitation and protest, and he promoted this view in his writing and in his organizing work. He was a pioneering advocate of black nationalism and Pan-Africanism, and he urged his readers to see “Beauty in Black.”
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U.S. participation in NATO was a break with tradition, since the United States for the first time set itself up to automatically get involved in foreign conflicts--something that was very unnerving for a country of people who for most of American's history had been very isolationist.
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When he went to Milan, the Duke Sforza appointed him to be a military engineer where he had to design weapons and technological advancements that would help the duke gain warfare supremacy against enemies. He also built buildings and defenses, not just offensive weapons.