How did World War 2 lead to heightened racial tensions in the United states?

World War II intensified racial tensions in the United States due to the juxtaposition of fighting for democracy abroad while racial discrimination persisted at home. The war effort led to the migration of African Americans to urban centers for jobs in war industries, increasing competition for resources and housing. Additionally, the contradiction between the ideals of freedom and equality and the realities of segregation and racism sparked civil rights activism. These dynamics culminated in heightened awareness and activism around racial issues, setting the stage for the Civil Rights Movement in the post-war era.