Sunni and Shia in Islam and the tragedy of karbala.

This happened in the latter stages of the Early Muslim Expansion, as the Rashidun caliphs - Umar, Uthman, and Ali were assassinated, which led to the war of succession, the killing of Ali's son Husayn in Karbala, and the creation of the Umayyad dynasty under Muawiyah I.
Sunni Shai split in Islam.
Original video credit goes to ‪@KingsandGenerals‬