Supporters of Rousseau argued that Rousseau was not alone among republican political theorists in thinking that small, homogeneous states were best suited to maintaining the freedom of their citizens. Montesquieu and Machiavelli were also of this opinion. Furthermore, Rousseau envisioned his "Social Contract" as part of a projected larger work on political philosophy, which would have dealt with issues in larger states. Some of his later writings, such as his "Discourse on Political Economy", his proposals for a Constitution of Poland, and his essay on maintaining perpetual peace, in which he recommends a federated European Union, gave an idea of the future direction of his thought.