While a member of Congress, Madison was an ardent supporter of a close alliance between the United States and France, and, as an advocate of westward expansion, he insisted that the new nation had to assure its right to navigation on the Mississippi River and control of all lands east of it in the Treaty of Paris that ended the Revolutionary War. He committed to an intense study of law and political theory, and was heavily influenced by Enlightenment texts sent by Jefferson from France. He especially sought out works on international law and the constitutions of 'ancient and modern confederacies' such as the Dutch Republic, the Swiss Confederation, and the Achaean League. Domestically, the Jefferson administration and the Democratic-Republican Congress rolled back many Federalist policies; Congress quickly repealed the Alien and Sedition Act, abolished internal taxes, and reduced the size of the army and navy. Gallatin did, however, convince Jefferson to retain the First Bank of the United States.