In Federalist No. 12, Hamilton wrote that "[t]he prosperity of commerce" is, and will increasingly become, "the primary object of our political cares." He explained that the "interests" of the working citizenry are "intimately blended and interwoven." And this reality, claims Hamilton via and according to Cost, will insure American society today endures the turbulent, polarized affairs in which we find ourselves.
To read Cost's full article, I direct you to National Review's site below...
It should be noted that the Founders also had much to say about religion and morality being important to preserving the glue which binds us together. See Washington's Farewell Address (which incidentally Hamilton had a hand in writing). But even if Cost is correct in his emphasis on economics, the glue only works so long as Americans embrace the system given to us by our Founders, namely free market economics. If the nation turns away from capitalism and more toward socialism, we may find Cost's hopeful optimism misplaced.