The assassination of Martin Luther King, Jr. caused a turning point in 1968 because King was

King was a leading civil rights activist who promoted nonviolent protests and civil disobedience to challenge racial segregation and discrimination. His assassination in 1968 shocked the nation and intensified civil rights tensions, making it a turning point. He was not a member of the House of Representatives, and the other choices do not describe the central role for which he was known.

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