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alternatehistory.com
One of the more interesting yet neglected areas of history would have to be Al-Andalus, the half-millenium of Muslim control of large parts of Spain.
At its greatest extent, over three quarters of the Iberian peninsula were under Muslim control. So, the question: what would it have taken for the Moors to push the Christians all the way to the Pyrenees? And what might the consequences have been?