This book is the first and only history of the U.S. postwar Friendship, Commerce, and Navigation (FCN) treaty program, and focuses on the investment-related provisions of those treaties. This author explains the original understanding of the language of this vast network of agreements which have been and continue to be the subject of hundreds of international arbitrations and billions of dollars in claims. It is based on a review of some 32,000 pages of negotiating history housed in the National Archives.