What are you talking about? The overwhelming majority of blacks who came to this country, came here involuntarily as slaves. As such, they weren't given the chance to assimilate into ordinary American society. I thought that was self-evident.
Immigration since that time has been voluntary or internal.
Internal immigrants are already part of the system - what part of that system is up to them and not me.
My ancestors came over both free and indentured, Irish and others. I've got problems too; but they are my problems and not subject to any reparations or guilt on the part of anyone whose ancestors needed Irish labor to keep the furnaces glowing.