Why did african american students in greensboro north carolina stage a sit-in in 1960?

They were denied service in a restaurant.

b) the importance and limits of political power.

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.