This document provides an introduction to liberalism and the liberal internationalism and democratic peace propositions. It outlines some of the key authors and thinkers in liberalism like Kant, Rousseau, Fukuyama and others. It discusses the liberal preconditions for peace, including democracy, free trade, and collective security. It also examines the democratic peace proposition that democracies are less likely to go to war with each other. Finally, it briefly discusses the new international arena and liberalism's role in promoting peace through interdependence today.