This chapter explores the constitution-making processes in post-war Japan and Kosovo, highlighting both the advantages and limitations of U.S. involvement. While the American role brought stabilization by introducing legal frameworks, it also limited local voices. Japan’s Article 9 and Kosovo’s Article 126 reflect this dynamic by embedding demilitarization within the broader U.S. post-war vision. These constitutional constraints, however, raise broader questions about sovereignty, external influence, and whether such limitations remain viable in today’s evolving security environment. Ultimately, the chapter assesses the long-term implications of the U.S. role in constitution drafting of Japan and Kosovo for national identity, defense policy, and regional security.