It convinced union voter that the north was getting better or progressing at war. I hope this helps.
Sweatt vs Painter was a US Supreme Court case that successfully challenged the "separate but equal" doctrine of racial segregation established by the 1896 case Plessy vs Ferguson. The case involved a black man, Herman Marion Sweatt, who was refused admission to the School of Law of the University of Texas.
To to initiate an armed slave revolt