Drawing in historical threads from religious, legal and foreign policy work, the book demonstrates how American comparative law ultimately became a marginalized practice in this process. The marginalization belies its central place in earlier eras of American political and legal reform. In doing so, the book reveals how the cosmopolitan dynamism so prevalent at the Founding is a lost virtue that today comprises a serious challenge to American legal culture and its capacity for legal innovation in the face of an increasingly competitive and multi-polar 21st century. Once again, America's relationship with China presents a critical opportunity to recapture this lost virtue and stimulate the searching cosmopolitanism that helped forge the original foundations of American democracy.