How did Muslims create such an advanced society in Spain

Islam was a widespread religion in the Iberian Peninsula, beginning with the Umayyad conquest of Hispania and ending (at least overtly) with its prohibition by the modern Spanish state in the mid-16th century and the expulsion of the Moriscos in the early 17th century, an ethnic and religious minority of around 500,000 ...

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Militarism is the answer.