Which of these events initially signified a shift in tactics employed by the civil rights movement?

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The sit-in at Woolworth's lunch counter in Greensboro, North Carolina in 1960 was a pivotal moment in the civil rights movement. This was the first time that nonviolent direct action was used on a large scale and it sparked a wave of sit-ins throughout the South, leading to the desegregation of many public places. It represented a shift in tactics from using court cases and legal challenges to direct action and civil disobedience.

Which of These Events Initially Signified a Shift in Tactics