Answer:
The fight against fascism during World War II brought to the forefront the contradictions between America's ideals of democracy and equality and its treatment of racial minorities. Throughout the war, the NAACP and other civil rights organizations worked to end discrimination in the armed forces.
The answer is B, because the cause of the Sudan civil war was a clear split between north and south Sudan. You can also see other examples like the unhappy Kurdish minorities in Syria, Turkey, and Iraq.