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In page Detroit:

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The demographic shifts caused by industrialization led to significant racial tensions in Detroit. The Great Migration brought African Americans from the South, while many southern and eastern European immigrants also moved to the city. Competition for jobs and housing fueled tensions between different ethnic and racial groups.[citation needed] This period saw the rise of the Ku Klux Klan in Detroit, which became a powerful force in the city during the 1920s, targeting Black, Catholic, and Jewish communities.[5] Even after the Klan's decline, the Black Legion, a secret vigilante group, continued to spread fear in the 1930s.[6]