Final answer:
The split in the Islamic community after Muhammad's death was caused by differences in opinion on leadership, disagreements over religious practices, and political power struggles.
Step-by-step explanation:
The split in the Islamic community after Muhammad's death was caused by all of the above: differences in opinion on who should succeed Muhammad as the leader, disagreements over religious practices and interpretations, and political power struggles.
Upon Muhammad's death, there were disagreements about leadership as well as differences in religious interpretations and practices. Some believed that leadership should pass to Muhammad's son-in-law Ali, while others supported Abu Bakr, a respected elder of the community. These disagreements led to political power struggles and ultimately resulted in the split between Sunni and Shia Islam.