The root cause of division and sects in Muslims. Both Shia and Sunni are wrong.

Please read Hashim, Abdul Muttalib, Abu Talib, Battle of Jamal, Siffin 1, Siffin 2 and Karbala with this article.
After Usman people of Madina stood for Ali bin Abi Talib to become the fourth caliph. Except a few senior companions all agreed on Ali and forced him to take their allegiance as he was not accepting. Among those who were against Ali were Zubair and Talhah the same two companions of Prophet which were nominees for caliphate and member of the committee when Umar was dying.
What caused the division of Islam?
Remember the general division between Sunni and Shia Muslims is over who should succeed Muhammad after his death as the leader of the Muslim community. Shia believes it should be members of Muhammad’s family and especially descendants of Muhammad. While Sunni considers that Muhammad did not announce his successor and Abu Bakr his father in Law was rightly elected as Caliph.

Both Sunni and Shia are wrong
Sunni and Shia both have taken extreme positions and both are wrong as the Sunni belief of innocence of Companions of the prophet is as wrong as the Shia belief of Infallibility of Imams. Fact is that only my Lord the Al-Mighty the All Wise is perfect while everyone else including prophets are mere human beings and His slaves.
Will come soon!
Will come soon!
Will come soon!
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A Synthesis of Religions. O Mankind I am presenting you the case of God,, يا أيّها الجنس البشري؛أنا أقدم لكم "قضية الله, ¡Oh humanidad! Les estoy presentando el caso de Dios, O люди, я представляю вам дело Божие, ای بشر من سخنان خدا را به تو عرضه می کنم., Ey insanlık, ben sana Tanrı'nın davasını sunuyorum, 哦人类,我向你展示上帝的情形, اے بنی نوع انسان میں آپ کے سامنے خدا کا مقدمہ رکھتا ہوں
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