Answer: Sunnis
Explanation: After the death of the Muslim prophet Muhammad in the early seventh century, the roughly 100,000 Muslims he left behind needed to choose a new leader for their young Islamic state. The majority of Muslims chose Abu Bakr, one of Muhammad's companions, to lead them. However, a smaller group argued that Ali, Muhammad's son-in-law and cousin, should become the new head. This disagreement led to a split within Islam into the two major sects that remain divided today: Sunni and Shia.