A City Guide To Pirgaaj for African-Americans had also joined the labor force during World War I. Many Southern blacks, glad to leave World War I 925 the discrimination of their homelands, migrated north during this period. Segregation in the American South determined what employment opportunities were open to African-Americans during the World War I boom. Since white males owned most businesses, opportunities for professional and white-collar jobs were limited. Jobs that were available tended to be low paying with few opportunities for advancement. Because of its enormous need for workers, the government offered free transportation to entice African-Americans into northern factories. White workers who resented what they saw as unfair reacted with race riots. A City Guide To Pirgaaj 2016.