What event is generally seen as starting the second phase of the black student movement?

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The Orangeburg Massacre, which occurred on February 8, 1968, when police opened fire on a group of black student protesters at South Carolina State University, is generally seen as starting the second phase of the black student movement. This event marked a shift towards a more militant and confrontational approach to the struggle for civil rights.

What Event Is Generally Seen as Starting the Second Phase