What issue led to the division of the islamic community?

The Death of the Prophet Muhammed led to the biggest divisions in the Islamic Community.

The lack of a clear succession plan forced two factions to emerge, which are today known as the Shias and the Sunnis. From there, the Shias and the Sunnis has their own sub groups but the primary division is between who each group recognizes as the heir to Muhammed.

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.