How did the civil rights guaranteed by the aforementioned laws became a reality to all of america?

The 13th amendment explicitly banned slavery and involuntary servitude in the united states.

I had to look for the missing image here and here is my answer.
Based on the given illustration which shows the flow of the product market, segment A here marks an arrow from the government then to the product market. Based on this, segment A here would be the second option scenario: sells directly to public school districts and other educational institutions. Hope this helps.