Which was one major source of conflict during the civil rights movement of the 1940s to 1950s

I'm not sure if there were supposed to be options for us to choose from along with this question, but one conflict that arose during the Civil Rights Movement was segregation or Jim Crowe Laws.

The Montgomery bus boycott

Explanation:

APEX

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,

coin toss of the tosses to the toss