What causes is going to split into sunni and shia branches

The original split between Sunnis and Shiites occurred soon after the death of the Prophet Muhammad, in the year 632. ... And it was fundamentally that political division that began the Sunni-Shia split." The Sunnis prevailed and chose a successor to be the first caliph.

mark brainliest thanks;)

i am not 100% positive but i think it is is b. both are non-partisan jobs

i am pretty sure that members of congress have term limits, can be impeached, and are nominated through direct popular vote.