Which aspects of islam would have appealed to the poor, enslaved, and isolated - many the first muslim converts?

Muslims did not have to pay taxes, other than giving zakat-alms (mentioned in the Five Pillars) while Non-Muslims did have to pay taxes. The four classes of the Muslim Empire stated that Muslim converts were second class. These advantages would have appealed to the poverty-suffering Islamic converts.

Islam teaches that all humans are equal. A white man has no claim of superiority to a black man. The criterion of Superiority is Piety. All human beings are the off-spring of ONE and the Same Almighty Allah (God). He has created them and loves them all. This equality appealed to the slaves and the poor to convert to Islam.

If i’m not mistaken your answer should be the freemen’s bureau started them. i really hope i could ! good luck