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 demand for war materials surged during WWI, leading factories to hire more workers, including African Americans.
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A reduction in the number of European immigrants - Many European immigrants who would typically fill these factory jobs were either serving in the war or unable to come to the U.S. due to the war, creating more opportunities for African American workers to enter the industrial workforce.
These factors contributed to what is known as the Great Migration, where many African Americans moved from the South to northern cities in search of better job opportunities.