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.        

the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.

they spoke the dravidian language. hope this , correct me if im wrong