A young man mourns at a funeral for a relative killed in an attack on the Shii'te enclave Sadr City in November 2006. It is believed that Sunni arab militants were responsible for the blasts, which killed over 150 people.
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Islam's schism began in A.D. 632, immediately after the Prophet Muhammad died without naming a successor as leader of the new Muslim flock. Some of his followers believed the role of Caliph, or viceroy of God, should be passed down Muhammad's bloodline, starting with his cousin and son-in-law, Ali ibn Abi Talib. But the majority backed the Prophet's friend Abu Bakr, who duly became Caliph. Ali would eventually become the fourth Caliph before being murdered in A.D. 661 by a heretic near Kufa, now in Iraq. The succession was once again disputed, and this time it led to a formal split. The majority backed the claim of Mu'awiyah, Governor of Syria, and his son Yazid. Ali's supporters, who would eventually be known collectively as Shi'at Ali, or partisans of Ali, agitated for his son Hussein. When the two sides met on a battlefield near modern Karbala on Oct. 10, 680, Hussein was killed and decapitated. But rather than nipping the Shi'ite movement in the bud, his death gave it a martyr. In Shi'ite eyes, Hussein is a just and humane figure who stood up to a mighty oppressor. The annual mourning of Hussein's death, known as Ashura, is the most poignant and spectacular of Shi'ite ceremonies: the faithful march in the streets, beating their chests and crying in sorrow. The extremely devout flagellate themselves with swords and whips.
Those loyal to Mu'awiyah and his successors as Caliph would eventually be known as Sunnis, meaning followers of the Sunnah, or Way, of the Prophet. Since the Caliph was often the political head of the Islamic empire as well as its religious leader, imperial patronage helped make Sunni Islam the dominant sect. Today about 90% of Muslims worldwide are Sunnis. But Shi'ism would always attract some of those who felt oppressed by the empire. Shi'ites continued to venerate the Imams, or the descendants of the Prophet, until the 12th Imam, Mohammed al-Mahdi (the Guided One), who disappeared in the 9th century at the location of the Samarra shrine in Iraq. Mainstream Shi'ites believe that al-Mahdi is mystically hidden and will emerge on an unspecified date to usher in a reign of justice.
Shi'ites soon formed the majority in the areas that would become the modern states of Iraq, Iran, Bahrain and Azerbaijan. There are also significant Shi'ite minorities in other Muslim states, including Saudi Arabia, Lebanon and Pakistan. Crucially, Shi'ites outnumber Sunnis in the Middle East's major oil-producing regions — not only Iran and Iraq but also eastern Saudi Arabia. But outside Iran, Sunnis have historically had a lock on political power, even where Shi'ites have the numerical advantage. (The one place where the opposite holds true is modern Syria, which is mostly Sunni but since 1970 has been ruled by a small Shi'ite subsect known as the Alawites.) Sunni rulers maintained their monopoly on power by excluding Shi'ites from the military and bureaucracy; for much of Islamic history, a ruling Sunni élite treated Shi'ites as an underclass, limited to manual labor and denied a fair share of state resources.
The rulers used religious arguments to justify oppression. Shi'ites, they said, were not genuine Muslims but heretics. Devised for political convenience, this view of Shi'ites solidified into institutionalized prejudice. Sunnis likened reverence for the Prophet's bloodline and the Shi'ites' fondness for portraits of some of the Imams to the sin of idolatry. Shi'ite rituals, especially the self-flagellation during Ashura, were derided as pagan. Many rulers forbade such ceremonies, fearing that large gatherings would quickly turn into political uprisings. (Ashura was banned during most of Saddam Hussein's rule and resumed only after his downfall in 2003.) "For Shi'ites, Sunni rule has been like living under apartheid," says Vali Nasr, senior fellow at the Council on Foreign Relations and author of The Shia Revival: How Conflicts Within Islam Will Shape the Future.
But religious repression was uneven. Sunni Caliphs in Baghdad tolerated and sometimes contributed to the development of Najaf and Karbala as the most important centers of Shi'ite learning. Shi'ite ayatullahs, as long as they refrained from open defiance of the ruling élite, could run seminaries and collect tithes from their followers. The shrines of Shi'ite Imams in Najaf, Karbala, Samarra and Khadamiya were allowed to become magnets for pilgrimage.
Sectarian relations worsened in the 16th century. By then the seat of Sunni power had moved to Istanbul. When the Turkish Sunni Ottomans fought a series of wars with the Shi'ite Safavids of Persia, the Arabs caught in between were sometimes obliged to take sides. Sectarian suspicions planted then have never fully subsided, and Sunni Arabs still pejoratively label Shi'ites as "Persians" or "Safavis." The Ottomans eventually won control of the Arab territories and cemented Sunni dominance. The British, the next power in the Middle East, did nothing to change the equation. In the settlement after World War I, they handed the newly created states of Iraq and Bahrain, both with Shi'ite majorities, to Sunni monarchs.
Saddam's Legacy
When Saddam Hussein assumed power in Baghdad in 1979, Iraq's Shi'ites had enjoyed a couple of decades of respite under leaders who allowed them some measure of equality with the Sunnis. Then came Ayatullah Ruhollah Khomeini's 1979 Islamic revolution in Iran. Fearing a similar uprising in Iraq, Saddam revived some old repressions and ordered the murder of Iraq's most popular ayatullah, Mohammed Bakr al-Sadr, uncle of Muqtada. Shi'ites made up a majority of those killed in Iraq's war with Iran, which lasted from 1980 to 1988, but after it ended they were once again shut out of most senior government and military positions. With the defeat of Saddam's army in the 1991 Gulf War, Shi'ites saw a chance to rise against the dictator. But they received no protection from the allied forces, and Saddam was able to smash the revolt. By some estimates, more than 300,000 Shi'ites were killed; many were buried in mass graves. For the rest of his reign, Saddam kept the Shi'ites firmly under his thumb. Several popular clerics were killed, including Muqtada's father. Saddam ordered the murder of Sunnis too, but there was a crucial difference. "When Saddam killed a Sunni, it was personal — because of something that person had done," says author Nasr. "But when it came to killing Shi'ites, he was indiscriminate. He didn't need a specific reason. Their being Shi'ite was enough."