Legal historian John Phillip Reid has written that the emphasis on the political philosophy of the Declaration has been misplaced. The Declaration is not a philosophical tract about natural rights, argues Reid, but is instead a legal document—an indictment against King George for violating the constitutional rights of the colonists. As such, it follows the process of the 1550 "Magdeburg Confession", which legitimized resistance against Holy Roman Emperor Charles V in a multi-step legal formula now known as the doctrine of the Lesser magistrate. Historian David Armitage has argued that the Declaration was strongly influenced by de Vattel's "The Law of Nations", the dominant international law treatise of the period, and a book that Benjamin Franklin said was "continually in the hands of the members of our Congress". Armitage writes, "Vattel made independence fundamental to his definition of statehood"; therefore, the primary purpose of the Declaration was "to express the international legal sovereignty of the United States". If the United States were to have any hope of being recognized by the European powers, the American revolutionaries first had to make it clear that they were no longer dependent on Great Britain. The Declaration of Independence does not have the force of law domestically, but nevertheless it may help to provide historical and legal clarity about the Constitution and other laws.