The people follow the Quraish and the Caliphate belongs to the Quraish
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنْ دَاوُدَ، عَنِ الشَّعْبِيِّ، عَنْ جَابِرِ، بْنِ سَمُرَةَ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " لاَ يَزَالُ هَذَا الأَمْرُ عَزِيزًا إِلَى اثْنَىْ عَشَرَ خَلِيفَةً " . قَالَ ثُمَّ تَكَلَّمَ بِشَىْءٍ لَمْ أَفْهَمْهُ فَقُلْتُ لأَبِي مَا قَالَ فَقَالَ " كُلُّهُمْ مِنْ قُرَيْشٍ " .
It has been narrated on the authority of Jabir b. Samura that the Prophet (ﷺ) said: This order will continue to be dominant until there have been twelve Caliphs. The narrator says: Then he said something which I could not understand, and I said to my father: What did he say? My father told me that he said that all of them (Caliphs) would be from the Quraish.