mention the fist two early caliphates
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The first caliphate, the Rāshidun Caliphate, immediately succeeded Muhammad after his death in 632.The four Rāshidun caliphs were chosen through shura, a process of community consultation that some consider to be an early form of Islamic democracy. The fourth caliph, Ali, who, unlike the prior three, was from the same clan as Muhammad (Banu Hāshim), is considered by Shia Muslims to be the first rightful caliph and Imam after Muhammad.[9] Ali reigned during the First Fitnā (656–661), a civil war between supporters of Ali and supporters of the assassinated previous caliph, Uthman, from Banu Umayya, as well as rebels in Egypt; the war led to the establishment of the Umayyad Caliphate under Muāwiyah I in 661.
The second caliphate, the Umayyad Caliphate, was ruled by Banu Umayya, a Meccan clan descended from Umayya ibn Abd Shams. The caliphate continued the Arab conquests, incorporating the Caucasus, Transoxiana, Sindh, the Maghreb and the Iberian Peninsula (Al-Andalus) into the Muslim world. The caliphate had considerable acceptance of the Christians within its territory, necessitated by their large numbers, especially in the region of Syria.Following the Abbasid Revolution from 746 to 750, which primarily arose from non-Arab Muslim disenfranchisement, the Abbāsid Caliphate was established in 750.