In the past decades historians have interpreted early modern Christian missions not simply as an adjunct to Western imperialism, but a privileged field for cross-cultural encounters. Placing the Jesuit missions into a global phenomenon that emphasizes economic and cultural relations between Europe and the East, this book analyzes the possibilities and limitations of the religious conversion in the Micronesian islands of Guåhan (or Guam) and the Northern Marianas. Frontiers are not rigid spatial lines separating culturally different groups of people, but rather active agents in the transformation of cultures. By bringing this local dimension to the fore, the book adheres to a process of missionary glocalization which allowed Chamorros to enter the international community as members of Spain’s regional empire and the global communion of the Roman Catholic Church.