Where did the city of Chicago encouraged African American migration by?

After the US Civil War, black Chicagoans had access to better schools, greater access to public facilities and leisure activities, and they were able to vote.

Due to World War 1, workers were needed for Chicago's industries. Those jobs were opened up to blacks. Wages were much better than anything offered in the South. There were no formal segregation laws in Chicago, and the blacks had access to schools, and were able to vote, all encouragement for African Americans to migrate to Chicago.
giving african americans voting rights

getting rid of segregated schools

passing laws against discrimination in public places