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Demonstrators march in front of the White House in Washington, D.C., after the assassination of the Rev. Martin Luther King Jr. in April 1968. (Library of Congress/U.S. News & World Report Magazine collection/Marion S. Trikosko)
Demonstrators march in front of the White House in Washington, D.C., after the assassination of the Rev. Martin Luther King Jr. in April 1968. (Library of Congress/U.S. News & World Report Magazine collection/Marion S. Trikosko)