Arab battles in Al-Andalus

Al-Andalus, that state ruled by Muslims for about eight centuries, and where they established a timeless civilization evidenced by the remains of palaces and cities they left behind, and by the works of their scholars, and their role in enriching the foundations of European civilization. So why did Al-Andalus fall? A question that sparks surprise, but when we read "The Battles of Al-Andalus," our surprise disappears; as Petrus al-Bustani traced in his book the battles fought by the West to seize Al-Andalus, presenting the reasons for the weakness of the Andalusians; Al-Andalus lost its unity when the minister "Abu al-Hazm ibn Juhur" announced the fall of the state and its disintegration into 22 small emirates; which paved the way for the West to seize them one after the other, and the last of these emirates was Granada, which fell in 1492 AD without the Muslims moving a finger; the Mamluk and Ottoman states preferred to play the role of spectators, allowing the Arab kingdom, the center of Islamic civilization and enlightenment, to fall.