One group can be African Americans. Racist states found ways to prevent them from voting by imposing things like laws that force you to take a literacy test or similar. They also forbade them from working like regular workers by introducing the cropsharing system.
Another can be women. Women had been fighting for their political rights since before the war began. After it ended, they were still not given voting rights which lasted up until 1920s. Many women objected how African-Americans could be given voting rights and women
Third group can be Native Americans. After the war ended, the country could then start spreading westwards which had to be halted due to the war. More states began being added and this meant that Natives would have to move to reservations and their rights and land were being taken from them.
