The two correct answers that led to a significant increase in the number of factory jobs available to African American workers during World War I are:
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Increased production of war materials - The need for war materials led to a surge in industrial production, creating more factory jobs.
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A reduction in the number of European immigrants - With many European immigrants departing for the war or unable to come to the U.S., factories were in need of workers, which opened up opportunities for African American workers.
These factors combined significantly altered the labor landscape during that time.