Okay, I can easily explain how a legacy of slavery can have disparate effects across races.I contend they are just as responsible if not more so than your hallowed “legacy of slavery.”
Black people were slaves, and were not allowed to accumulate any of the fruit of their labor as capital. White people were slave owners and were able to accumulate to fruits of their slave's labor as capital.
Now explain how race neutral welfare policies can have a disparate effect on races.