How did the end of World War I affect the economic opportunities available to women and African Americans? Both groups enjoyed increased opportunities after the war. Women gained jobs, but African Americans lost them. It spelled the end of many economic opportunities for both groups. It had little effect on either group.

The correct answer is:

It spelled the end of many economic opportunities for both groups.

After the World War I, women and African Americans were mainly affected by the return of veterans from war, who would most of the time take their jobs. Especially women, were put in a "secondary" position, where their work force was seen not as priority, or primary, but to "complement" men's work. There were services for nurses, cleaners, secretarial opportunities and so on.