What is the date that the Division of Islam occurred?

I need to know the year that the Islam religion split into Sunnis and Shi’ites for a history project. I can’t find the date anywhere online. Thanks.

Shia history-

http://www.islamfortoday.com/shia.htm

The original split between Sunnis and Shia occurred soon after the death of the Prophet Muhammad, in the year 632.

Sunni

http://www.islamicity.com/articles/Articles.asp?ref=AB0602-2926

The division between Shia and Sunni dates back to the death of the Prophet Muhammad , and the question of who was to take over the leadership of the Muslim nation. Sunni Muslims agree with the position taken by many of the Prophet’s companions, that the new leader should be elected from among those capable of the job. This is what was done, and the Prophet Muhammad’s close friend and advisor, Abu Bakr, became the first Caliph of the Islamic nation.

Its advisable not to name Sunni and Shia. Name it as Muslims altogether. Allah forbids separation of Islam and Muslimins.

It is important to remember that despite all of these differences in opinion and practice, Shia and Sunni Muslims share the main articles of Islamic belief ..

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