Violence exploding in public spaces, corruption by political figures and economic elites, the will of the people thwarted in both elections and votes in the senate, military misadventures abroad, and rampant economic inequality at home diminishing a shared sense of the common good - in sum, a republic in disarray. These descriptions are not only familiar from ancient Roman political and social life but are also recognizable to any United States citizen who follows the news and American civic life. On the Republic proceeds chronologically through the fall of the Roman Republic beginning in 133 BCE and continuing down to around 14 CE, providing a continuous narrative of the fall of the Roman Republic juxtaposed with the contemporary political landscape of the United States.

On the Republic focuses on four constellations of lessons that represent the most significant things which the fall of the Roman Republic has to teach us at this time: the dangers of political violence, the inability of individuals and institutions to save us, the finality of the loss of freedom, and lastly the importance of civic virtue. In 20 short chapters, On the Republic explores how the United States now faces many of the same challenges that toppled the Roman Republic - political divisions, economic inequality, and creeping authoritarianism. How we respond to these challenges today will determine the future of American democracy.

On the Republic is not a book about the fall of ancient Rome to so-called barbarians overrunning the border. It addresses the fall of a democratic society (the Roman Republic) into an autocracy (the Roman empire). This is not a book about sexual debauchery and gluttony, but a serious reading of political events that had serious consequences. On the Republic offers modern readers lessons that, while sobering, can also empower them to participate in political life in new ways. History is a means not to predict the future, but rather to stir the civic imagination of its readers.