You must have missed it.
Not long after oil was discovered.
Some of these places have simply been more… compliant… than others and their success monetarily for that cooperation is quite evident.
The ones who have rebelled have been fraught with the most issues.
Again, history is something available to every one to learn and benefit from.
Quote:
Petroleum was discovered in Saudi Arabia in 1938 by SoCal, after Ibn Saud granted a concession in 1933.[44] Through his advisers St John Philby and Ameen Rihani, Ibn Saud granted substantial authority over Saudi oil fields to American oil companies in 1944.
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If you don't like Wikipedia as your reference, then do your own research.
If you don't thing the longevity of the current lineage of Saudi kings is pure coincidence with the first king giving Americans a sweet deal in 1944, then I can't help you understand this.
Hate the Islamic countries all you want. But some are more amenable than others, and it's smart ones who gave up jihad for oil profits.
And yes, I know radicals have come from Saudi, but the rulers have been primarily compliant in Saudi, UAE, pre Iran Islamic revolution.