The main cause was because they had already established land but the white settlers took it from them. For Native Americans, this was unacceptable.
C and pls don’t click the link
Britain tried to ease growing tensions on the American frontier by issuing a proclamation called Proclamation of 1763. The proclamation made colonists angry.
The split into Sunni and Shia of the religion of Islam can traced back to the dispute over the question of Muhammad's successor. Thus, the answer is letter C. It was believed that the dispute emerged in 632 just after the death of the Prophet Muhammad.