The correct answer is:
African Americans enlisted in the military and took jobs in wartime factories.
CAUSED
Federal Lawmakers outlawed discrimination in most areas of life.
After the great work African American did in war and in wartime factories, President Truman pushed to pass many civil rights acts using his executive powers, he appointed the first African American judge to the Federal Branch, he named African Americans to high-ranking administration positions and issued an executive order abolishing segregation in the armed forces - Executive Order 9981 -.
There were also important Supreme Courts decisions in favor of desegregation, this pushed a mass lobby of organization to press Congress, this way they passed civil rights legislations.