AHC/WI: Moorish state survives in the Iberian Peninsula.

I don't see a moorish (understood as North African rather than Arabo-Andalusian) state surviving in Al-Andalus, safe being the same than Morroco (basically a Maghreb covering Algraves as well).
After the fitna, the Christian takeover was a given : too divided principalities, Berber dynasties depending as well from an hold on Spain (ruling over a quite hostile local nobility) and Africa (always under the threat of a new berber tribe raising up) had enough issues without dividing it up, Christian presence and reinforcements from Europe, and of course the political-religious drive of Reconquista.

Grenada basically survived by the grace of being a Merinid and Castillan client (in an era where Castille was busy fighting itself).

Assuming Merinids doesn't go into oblivion, at least not that quickly, and that Castille (civil war resulting into two kingdoms?), Portugal and Aragon (maybe successful French takeover in the XIIIth?) gets significantly weakened at the same time that Morocco is strengthened, it could last.

Such an union wouldn't be that surprising given the established relationship well before Islam, but it would be hard to get and to maintain.
The main problem is the relative disinterest of north-western Arabs for sailing, safe for raids and ponctual matters (for instance, Abul Arab Musa said that crossing seas was maybe fit for a Christian, but certainly not for an Arab).

Having at least one Berber dynasty focusing more on fleet warfare would be a huge help for this (IOTL, the actual naval fights were rare, and Christians could be present in hostile waters without real threat). It did happen but later (too late, IMHO) for being able to hold a line.

Eventually, the consequences could lead to a quicker Age of Discovery : not only to bypass Ottomans and Mameluks, but Berbers as well. As for how it would change, I'm less confident : maybe not that easy takeover of India and Americas most probably.
Morrocans could even participe to this on their own, but only if they really search a rivality with Iberian states, which I'm somewhat doubtful.

Eventually, Morroco would have to do much to prevent inner crisis (that would have for worst consequence an opportunistic takeover of whatever remains in Spain) and Europe's rise would probably be a huge (if not too huge) obstacle.
It's doable, but hard.
 
A longer-lasting surviving fragment of Al-Andalus implies a politically fragmented Iberia for a longer period of time. The latter has more implications than the former when it pertains to who is among the great powers of Europe after the 15th C. and who will be building the overseas empires.

At most, even with a less successful Reconquista, the survival of a rump Al-Andalus will be totally at the whim of Castile and/or Aragon. This would require a less virulent hostility towards the Islamic and Jewish inhabitants of Iberia. Given the flavor and propaganda of Christianity in the period and the aims of the Christian rulers, this seems very unlikely. Because of divisions both within Al-Andalus and N.Africa, it is even less likely to see a resurgent Muslim state in Iberia, especially after the 13th C.
 
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