Prior to 1920, Harlem saw waves of African American migration as many fled the post-Civil War South. By 1920, over 150,000 black people lived in New York City, with Harlem becoming the center of black life and culture. Segregation and discrimination were still rampant, and tensions arose between recent southern migrants and Caribbean immigrants who had been in Harlem longer. The 1920s saw the flourishing of black arts and intellectual life in Harlem as residents celebrated their heritage and agitated for social change and equality.