In these concluding chapters, Isaacson shifts from examining the historical origins of the Declaration of Independence to discussing how its principles relate to contemporary American society. The argument moves toward questions of social division, civic responsibility, and shared public life. The concept of the “commons”—shared spaces, institutions, and values— a central idea in this discussion. Isaacson reframes the Declaration’s promise of “the pursuit of Happiness” as a principle connected to access to shared institutions and public opportunity. To do this, he introduces historian James Truslow Adams’s definition of the American Dream as an ideal where all individuals can “attain to the fullest stature of which they are innately capable” (33). Isaacson uses this definition to argue that the American Dream depends upon access to educational, economic, and civic opportunities that allow individuals to develop their abilities and participate fully in society.

Having established the commons as a source of shared opportunity, Isaacson examines its decline in recent decades. His diagnosis centers on what philosopher Michael Sandel terms the “skyboxification” of America, a metaphor describing the growing separation of society along economic lines. Isaacson uses this concept to describe how shared experiences, including public education and air travel, have increasingly become divided according to wealth and social status. He connects this fragmentation to economic changes that increased wealth for some Americans while reducing economic security and social mobility for many working-class communities. Isaacson argues that these divisions contributed to resentment, political polarization, and growing distrust between social groups. Through this discussion, he presents the weakening of the commons as a challenge to the American Dream and to the broader sense of shared civic identity within the United States.

Isaacson uses the figures of Thomas Jefferson and Benjamin Franklin highlight different ideas about merit, opportunity, and public life. He presents Jefferson’s proposal for a “natural aristocracy,” a system designed to identify and elevate the “best geniuses,” as an early form of merit-based social organization. This model, which Isaacson characterizes as “raking an elite from the rubbish” (36), is shown to be inherently divisive. In its place, he champions Franklin’s more inclusive and practical approach. Franklin’s concept of “true merit” was not about elite talent but about the “inclination joined with an ability to serve mankind” (37). This contrast is important to Isaacson’s argument, framing the modern debate over equality and opportunity as a continuation of a philosophical tension present at the nation’s founding. Franklin’s vision, rooted in building institutions that serve everyone, reflects Isaacson’s broader argument about expanding access to education, civic participation, and public resources.

The book concludes by positioning Benjamin Franklin as a central example of the civic ideals Isaacson associates with the Declaration’s principles. Isaacson opens the final chapter with Franklin’s famous warning that the Founders must “all hang together, or most assuredly we shall all hang separately” (39), framing civic unity as essential to the survival of the new nation. He then highlights Franklin’s contributions—the volunteer fire corps, the public hospital, the lending library, and his non-partisan newspaper—as examples of efforts to strengthen shared civic life and public participation. This focus on Franklin’s civic projects extends the book’s argument beyond the drafting of the Declaration to the broader work of building institutions that support social cooperation and shared opportunity. By ending with the image of Franklin’s funeral, attended by clergy of all faiths, Isaacson argues that the ideals expressed in the Declaration depend upon continued civic participation, mutual support, and investment in shared public life.