Clay's conversation with historian Louis Masur about his new book A Journey North: Jefferson, Madison, & the Forging of a Friendship. In 1791, Thomas Jefferson and James Madison went on a monthlong tour of New England. They were weary from their struggles with Alexander Hamilton for the soul of America. They needed a vacation, but as exemplars of the Enlightenment, they wanted to do some "botanizing," as they put it. They were interested in studying the Hessian Fly, which was devastating New England wheat production and seemed to be heading south to Maryland and Virginia. They wanted, like most tourists, to see American Revolution battlefields. They had been friends for more than a dozen years, but this journey deepened their political partnership. The Federalists accused them of making the journey to stir up political opposition to the Hamiltonian fiscal program; however, they were mostly exploring a part of America about which they knew little.