In this collection, thirteen prominent philosophers and political scientists address the nature of liberalism, its origins, and its meaning and proper interpretation. Some essays examine the writings of liberalism's earliest defenders, like John Locke and Adam Smith, or the influence of classical liberalism on the American founders. Some focus on the Progressive movement and the rise of the administrative state, while others defend particular conceptions of liberalism or examine liberal theories of justice, including those of John Rawls and Robert Nozick. Several essays discuss the U.S. Constitution, seeking to determine whether it is best viewed as empowering the federal government to achieve certain ends, or as strictly limiting its power to ensure the broadest freedom for individuals to pursue their own ends. Other essays address the limits of economic freedom or focus on the nature and extent of property rights and the government's power of eminent domain.