AHC: Arabian country comprising of entire Arabian peninsula with a post 1945 POD

mers-map-arabian-peninsula-large.png

This map somewhat describes what I want, sans Iran.

With a post 1945 POD, how could an Arabian country comprise of all the countries colored in brown and green, sans Iran? You can ignore Israel if you want.
 
Arab nationalism wank--the House of Sa'ud is overthrown by one of the Arab nationalist/Arab socialist movements in the country, who proceed to form a union with North Yemen and "export the revolution" so the speak to the other states of the Arab peninsula. Even if it's only a loose federation or ephemeral like the United Arab Republic, they might be able to form a union with the other countries of the Arab peninsula. Not sure how plausible Iraq, Syria, Jordan, or Palestine might be, especially long-term.
 
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