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The Hashemites currently rule Jordan, but were originally from Hejaz. They had to flee the country after the Sauds from Najd defeated them to create modern Saudi Arabia. The Hashemites came to rule Syria and Iraq following their exile, but were deposed as well.
What if things had gone differently and the Hashemites had maintained control over Hejaz, or possibly even defeated the Sauds in Najd and unified Arabia under themselves? Alternatively, what if the Syrian and/or Iraqi branches had maintained power?