@Xoxoxo You deny the purest Arabs were dark skinned and got replaced despite the hadiths, now read these backed by historical sources, first of all learn your Deen before you speak so ignorantly, I've sent the paintings of early Arab armies, all depict brown skinned people
The Ummayads saw themselves as superior, they massacred the family of the prophet SAW and discriminated non Arabs and Allah SWT says in the Quran he will always replace bad people for new good people
Now what happened??
The Abbasids arrived with a general from Khurasan leading great armies of Persians and central Asians, they conquered from east Khurasan to Kufa in modern day Iraq, the Abbasids later started massacring the Quraysh and the lands of the Arabs began to get filled with non Arab central Asians and Persians, there are many famous Persian families that assimilated now the 2 largest haplos are J1 and J2 both Persian
Also during conquests they everything in the captured territory is Ghaniima so millions of slaves, and when freed they take the masters tribe, and they had many European ones