Why did a schism occur between muslims after muhammad's death?

Though the two main sects within Islam, Sunni and Shia, agree on most of the fundamental beliefs and practices of Islam, a bitter split between the two goes back some 14 centuries. The divide originated with a dispute over who should succeed the Prophet Muhammad as leader of the Islamic faith he introduced.

Explanation:

A schism occur between muslims after muhammad death are the shia.

a. always outside of government control.