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As the title says, what if the House of Hashim controlled all or most of the Arabian Peninsula?
a) What PODs could achieve this? (To my knowledge they used to control Hejaz till 1925 and Iraq till 1958 and very briefly Syria. They still are in power in Jordan which perhaps the most stable country in the region.)
b) how would a united Arab kingdom look like with Hashemites in power and all of their territories united into one kingdom i.e. how would they do economically and militarily? What would the social conditions look like?
Bonus points if they can legitimately claim (and hold) the title of Caliph.