Dick Gregory takes on the specter of "America the Historic Reality," as distinguished from "America the Ideal," exemplified by our founding documents.
Using the opening example of his own reading of the Declaration of Independence as a school child, Gregory's work stands as a form of moral protest; the shouts of a PATRIOT taking to task his nation for falling short of those documented ideals. The sometimes large gap between our high ideals of freedom, opportunity, and democracy are cited repeatedly, stating in each chapter the fact that "we are not yet that nation we claim ourselves to be".
Covering topics from the earliest pilgrims, through major chapters of our history, and through large history-spanning topics (poverty, etc.), Gregory acts as iconoclast and presenter of actual history, not white washed (no pun intended) by others unwilling to speak true to history.
Frankly, historian James Loewen covers this ground much better in his "Lies My Teacher Told Me," but that book post-dates Gregory's work by roughly 2 decades, so this can hardly be a fault. However, Gregory's frequent colloquialisms and bitter tone does distract from the moral high ground he truly holds on each of the topics cited.