Question

The primary reason for the split between Sunni and Shia (or Shiite) Muslims was/is a disagreement about: whether or not to expand their empire the correct method of prayer the rightful successor (caliph) to Muhammad what to do about 'infidels', or non-believers

Answer 1

the rightful successor (caliph) to Muhammad

Step-by-step explanation:

The main recorded split between the Sunnis and Shiites happened around 632 when Prophet Muhammad died. The dispute happened in the community of these Muslims in Saudi Arabia as to who succeeds the departed prophet.

Many of the people who were ardent followers of the great prophet wanted the community of Muslims to say who would succeed the prophet and a certain group said that someone from his family, preferably Ali, who married Muhammad’s daughter, Fatimah, should succeed him.