The new protest tactic against segregation used by students in greensboro, north carolina, in 1960 was the

boycott
guerilla theater
teach-in
sit-in

sit-in

Explanation:

The Greensboro sit-in was a civil rights protest that started in 1960. Blair, Richmond, McCain and McNeil sat down at the lunch counter at the Woolworth’s downtown Greensboro, this place refused to serve anyone that was not white. When they had their service denied, they refused to give up their seats.

Police could not take action because the four of them did not provoke the police.

They stayed there until the store was closed, the next day they came back with more students. This caused a spread of the sit-in movement, many dining facilities integrated African-Americans across America.

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.