Why Is Saudi Arabia in Collision with Iran?

Saudi Arabia, the head of the Sunni world, is in collision with the Shia Iranian regime and is trying to build a Sunni coalition. During WWI, the Hashomite family, which traces its descendancy from Mohammed, was the keeper of the holy places of Mecca and Medina and expected to retain this power. The Middle East would look much different today if the Hashomites had been able to stay in control, but the bedouin Saud family was able to force the Hashomites out. The Saud family is wedded to the strict Wahabi version of Islam, which gave birth to Al Quaeda and ISIS.