Napoleon instituted lasting reforms, including higher education, a tax code, road and sewer systems, and established the Banque de France, the first central bank in French history. He negotiated the Concordat of 1801 with the Catholic Church, which sought to reconcile the mostly Catholic population to his regime. It was presented alongside the Organic Articles, which regulated public worship in France. His dissolution of the Holy Roman Empire paved the way to German Unification later in the 19th century. The sale of the Louisiana Territory to the United States doubled the size of the country and was a major event in American history.