Paraphrasing:
Muslims who invaded/robbed the subcontinent were ALREADY divided into vocation based social "classes" , including priests, nobles and others. Further, a racial segregation demarcated the local Muslim converts from foreign origin Muslims . The foreigner Muslims claimed a superior status as they were associated with the conquerors and categorized themselves as Ashraf ("noble").
Remember two things before you post next time:
1. Wikipedia is well-cited, and social strata issues are rampant amongst all people, including Muslims.
2. Messenger of Allah said “Even if he observes Saum (fasts), performs Salat (prayer) and claims to be a Muslim, the hypocrite does three things: When he speaks, he lies; when he makes a promise, he breaks it; and when he is trusted, he betrays his trust.”
The oppression of the caste-less was not new: it is described in both Dharmasutras and Manusmriti. The English exploited it, certainly, but they didn't need to invent it.
We wouldn't have all the saints of the Warkari tradition, who fought against caste oppression, without caste oppression to fight against.
