The article presents a speech by Ambassador Susan G. Esserman, a partner in the Washington office of Steptoe & Johnson LLP, delivered at the annual Canada-United States Law Institute Conference, titled "Understanding Each Other Across the Largest Undefended Border in History," on April 15-16, 2005 in Cleveland, Ohio. Esserman presents a historical perspective of the U.S.-Canada relations and the U.S. perspective on free trade agreements.