This work expounds the thought of Luis Muñoz Marín concerning the political status of Puerto Rico, articulating it in terms of natural law ethics. It thus clarifies the philosophical foundations on which the institutional structure of contemporary Puerto Rican society has been erected. Leader of the peaceful revolution which transformed Puerto Rico from a stricken land into a vital society, Muñoz is the founder of a new form of political association with the United States—the Commonwealth of Puerto Rico—which enriches not only American constitutional thought, but also the principles of federalism and democracy in general.