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 significant event that marked a shift in tactics employed by the civil rights movement. Instead of relying solely on legal action and protests, the sit-in employed nonviolent direct action tactics to demand equal rights and integration. This event inspired similar protests across the country and helped to galvanize the civil rights movement.

Which of These Events Initially Signified a Shift in Tactics