Difference between Shias and Sunnis

Shia and Sunni are the two major sects of Islam. Sunnis are the majority with around 85% population. They are majority in Arab countries,Pakistan and India. Shia are mainly concentrated in Iran and Iraq. After the death of Prophet Mohammed, there was a struggle for power in the followers of Mohammed. Abu Bakr who was the friend and father in law of Mohammed was elected as the leader called Caliph. Some of the followers thought that Ali who was son in law and cousin of Mohammed should have been made the leader as he belonged to the family of Mohammed and because of that the person would have spiritual powers in them. But the majority decided otherwise and Sunna means community from which Sunnis get their name.Sunnis believe that the leader need not be spiritually powerful but should be able to protect the faith. Where as Shias beleive that the leader should be spiritually advanced person. Later Ali became the fourth Caliph but was murdered by rival groups. Later Hussain who was the son of Ali was also killed in the battle of Karbalah along with his 72 followers. Shia mourn this period and this period is known as Ashura. Shias built shrines and visit them. Sunnis think that the Shias have deviated from Islam and lot of them don't consider the Shias as Muslims. Iran is a Shia power and in Iraq most of the people are Shias. Saudi Arab is the Sunni power house and House of Saud (the royal family) is supposed to the protector of the Sunnis. Sunnis are afraid that Shias who were till now dominated will start asserting themselfes. Al Qaeeda is a Sunni organisation whereas Hezbolla is a Shia militant organisation.