“The Shia are concentrated in Iran, southern Iraq, southern Lebanon and a minority in Syria.”
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You forgot to mention that the bulk of the oil of Saudi Arabia is found in the Eastern Province which is predominantly Shia in a sea of Sunni, but that the Shia do not benefit from it as much as the Sunnis do.
The Royal family of S.A. are all Sunni.
Very good and important point, also I could have mentioned that the Shia are primarily clients of Russia, and the US through the Saudis, supported Sunni-(Alot of good that did us!)