The Mormons kicked out of Missouri were free people before and after. They had access to all kinds of resources, were allowed to get an education, own land, accumulate wealth and (with limited exceptions) vote, etc.

Meanwhile basically all Black people in America were enslaved for the next 30 years, millions died under slavery and millions were suddenly freed and given nothing. "Separate but equal" wasn't even for another 30 years and segregation & Jim Crow were another 70 years after that!

By the time Black people were reasonably allowed to participate in US society, politics & business they had been forcibly held back in the only ways to get ahead (accumulating education, land and money) by hundreds of years.