This is an interesting criticism of American libertarianism, written by a libertarian, regarding its historical blind spot (at best) about the unfree condition of African Americans (both during and after the time of legal slavery). I think a lot of what Levy writes here is useful to keep in mind when teaching American government, particularly when covering concepts such as limited government, federalism, ideology, civil liberties, and civil rights.
‘Black Liberty Matters‘-Niskanen Center
Link to US Civitas Facebook Discussion Thread