How did the Jim Crow laws bring freedom to African Americans after the Civil War?
It would be very difficult to argue that Jim Crow laws brought freedom to African Americans. When Jim Crow laws were enacted after Reconstruction, they were clearly meant to limit the freedom of African Americans and to keep them "in their place" in the social hierarchy.
It is possible to argue that Jim Crow laws helped the black community by forcing all African Americans to live together and to form an insular community where people would support one another. That way, middle class and poor blacks all lived together and there was a strong social fabric. However, this is not the same thing as bringing freedom.
Even if they helped force the African American community to be strong and cohesive, Jim Crow laws took freedom away rather than giving it.