Why were Native Americans ultimately not chosen by European settlers as primary source of unpaid slave labor?

The claim of papal supremacy held that the pope had authority over all religions on earth. the pope was the chief authority over the papal states. the pope had authority over all kings and emperors. the pope was the head of the western christian church.

How would lincoln's assassination change the direction of reconstruction? the radicals used this opportunity to take control of the plans. the south refused to cooperate with any plans after lincoln his death would put an end to all reconstruction plans. lincoln was too weak to carry out his plan and now it could be carried out.

The slave dred scott sued for his freedom because he was born a free man. he had lived in a free state. slavery violated the 13th amendment he had been freed by pres. lincoln.