Building Bridges Between Communities, Cultures, and People for generations, Citizen diplomacy has helped create understanding, friendship, and cooperation across borders. By joining the Tucson Mexico Sister Cities Association, you become part of that important tradition. TMSC members help foster stronger Arizona-Mexico relationships through cultural programs, educational initiatives, leadership opportunities, community service, and international exchange. Whether you are an individual, a business leader, a student, or a young professional, your membership opens the door to unique experiences while supporting a mission that strengthens communities and promotes international friendship.