One hundred years of delay have passed since President Lincoln freed the slaves, yet their heirs, their grandsons, are not fully free. They are not yet freed from the bonds of injustice. They are not yet freed from social and economic oppression. And this Nation, for all its hopes and all its boasts, will not be fully free until all its citizens are free.
what does that mean?

Question

One hundred years of delay have passed since President Lincoln freed the slaves, yet their heirs, their grandsons, are not fully free. They are not yet freed from the bonds of injustice. They are not yet freed from social and economic oppression. And this Nation, for all its hopes and all its boasts, will not be fully free until all its citizens are free. 
what does that mean?

misssunshinexxoxo · Answer

He freed them physically but they are mentally having to pay for taxes, unfair laws, and require order overall. They will be finally free once they establish a fair system.

acarpenter2 · Answer

@misssunshinexxoxo , how would one pay taxes mentally? just wondering.