Movie: What’s the Fuss between Shias and Sunnis?

After the holy Prophet passed away the Muslims faced a dilemma, what do we do now? One group said after the Prophet we have to follow his successor –Imam Ali (P.B.U.H)- this is the  principle of Shia school of thought. Another group claimed that the holy Prophet not left the successor and they followed the Caliph Abu Bakr.