Chandler Tintype, Hollywood Indian Ledger, Harlem Heirs

What is the relationship behind the two men in this photo? Both wear Confederate uniforms, one is white, the other black. Did slaves fight in the Confederate army? What will this ledger tell us about how Hollywood treated Indian actors? And who are the Harlem Heirs, and what stake does this 1892 stock certificate give them in Harlem real estate?