How did emigration to industrial jobs in the north during world war 1 affect the united states economy?

Question: How did emigration to industrial jobs in the north during world war 1 affect the United States economy?

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Explanation: The Great Migration during WW1 was a change of homes for African American migrants from Southern farmlands to the urban cities of the industrialized North. Because of WW1, there was a shortage of labor in the northern factories. Millions of young men went to Europe to fight so factories and industries boomed and needed workers. Employers needed African-American workers to fill jobs so they would send agents to bring them North. African Americans were very hopeful and eager to leave their low-paying jobs in the rural South to go work in the North. It is estimated that between 300,000 and 500,000 migrated during this time.        

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts

answer; i believe the two groups were irish immigrants and chinese immigrants;