What are the motifs in Miracle at Philadelphia by Catherine Drinker Bowen?

As Bowen points out, ever since the Civil War, Americans have become used to thinking of division between the states as between North and South. While this division is present among the original 13 states, other perhaps deeper divisions run between the states at the time of the Constitutional Convention. Bowen reveals these in the course of her narrative and explains how they lead to the Constitution's final form. The potential for disunion between the states is, Bowen suggests, one of the biggest reasons for calling the Convention into being, the Articles of Confederation not being sufficient to keep them together.