how did world war 1 affect the racial and ethnic makeup of american cities

because or world war one, European immigration was interrupted and african americans moved north to factory towns bringing racism to america.

Answer:As of July 2016, White Americans are the racial majority. African Americans are the largest racial minority, comprising an estimated 12.7% of the population. Hispanic and Latino Americans are the largest ethnic minority, comprising an estimated 17.8% of the population.