Behind Stark Political Divisions, a More Complex Map of Sunnis and Shiites

The New York Times: Sunni-led allies of Saudi Arabia have cut diplomatic ties with Shiite Iran, further polarizing the Middle East along the two major branches of Islam. But while almost all of the governments are controlled by one sect, the countries’ populations are a mix of Sunnis and
Shiites, including sub-sects and other branches, an important factor in the region’s conflicts.

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