historical event leaded to the sunni and shiite conflict?

Question

can any1 please help me about giving me some info about the historical events that happened in the past and leaded to the sunni and shiite conflict, which we can see in iraq and lebanon?
any information whether if it was from you own knowlege or whether if its from the internet web pages would help, am just needing some different sources and different points of views in order to make sure i have inough information and to make a good argument, thanx in advance:)

Answer 1

Islam sets a merit of greatness on piety, regardless of relationships, wealth and castes.
After the demise of Prophet Muhammad pbuh, All the Muslims selected Abu Baker Siddique (may Allah be please on him) as the first Caliph of Islam, based upon the real merit of Islam, the most pious man and suitable for Caliphate.
The people who believe that the family relationship with Muhammad pbuh, is the merit of greatness, they wanted Ali bin Abu Taalib the cousin and son in law of Muhammad pbuh, be a Caliph. But he was too young at that time, (so he became the fourth Caliph).
This is the main problem, that created Sunnis and Shiites in Islam.
Later on the elder son of Ali bin abu Taalib, Hassan bin Ali (may Allah be pleased on him), succeeded to reunite the two main groups in Islam. But the after that the second son of Ali Husain bin Ali, destroyed the whole environment, by walking on the same track of his father.

Answer 2

I that's comparable in a fashion however the Shi'ism is almost as previous as Islam itself mutually as Protestanism became into based 1400 or so years after Catholic hegemony in Christianity. The Protestants fought for religious freedom mutually as Shiias combat for political and economic domination

Answer 3

Politics, of who is the rightful heir to be the Khalifat.