I offer three main sets of arguments. First, because states in the modern world are deeply interconnected in a variety of ways, orders are essential for facilitating efficient and timely interactions. There are different kinds of international orders, and which type emerges depends primarily on the global distribution of power. But when the system is unipolar, the political ideology of the sole pole also matters. Liberal international orders can arise only in unipolar systems where the leading state is a liberal democracy.