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In page Tulsa race massacre:

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Many servicemen returned to Tulsa following the end of the First World War in 1918. As they tried to re-enter the labor force, social tensions and white supremacist sentiment increased in cities where job competition was fierce.[citation needed] An economic slump in Northeastern Oklahoma increased the level of unemployment.[citation needed] The Civil War, which ended in 1865, was still in living memory; civil rights for African Americans were lacking.