Records in this series date primarily from the establishment of the apostolic delegation in the United States in 1893. The largest subseries is IX, "Diocesi," which includes formal business transacted between the ordinary of each diocese and the apostolic delegate, as well as information regarding each diocese collected by the apostolic delegate through newspapers, publications, and unsolicited letters from priests and lay people. It should not be assumed, however, that all the information on a diocese is filed in the Diocesi subseries. Subjects covered in other subseries (e.g. IV, "Liste Episcopali") that also concern specific dioceses may be filed under the other subseries. Subseries I, Delegazione Apostolica, contains a miscellany of materials including talks by the Apostolic Delegate, invitations, and both private and official correspondence. Subseries II, Stati Uniti- USA, also presents a miscellany of correspondence concerning such varied issues as scholastic training and formation of priests, Italian immigration, and changes in the diocesan boundaries. Subseries III, Nazioni Uniti (ONU), contains primarily printed news and resolutions of that organization. Subseries IV, Liste Episcopali, are episcopal nominations. Subseries V, Affari Esteri, reflects the delegates' involvement in various foreign affairs, largely in Mexico, Central and South America, and Cuba. This subseries also contains letters from people representing different ethnic background in the U.S. asking the delegate to comment about events in their native countries. Subseries VI, Canada, primarily concerns priests who emigrated to the U.S. Subseries VII, Isole Filippine, concerns Filipino Catholics after the Spanish American War, as well as printed material regarding Cuba and Puerto Rico. Subseries VIIIa, Messico, deals largely with religious persecution, and VIIIb covers priests who emigrated or were ordained in the U.S. and some social issues or disputes over church property. Subseries X, XI, and XXII, titled Diverse, Varie, and Documenti aggiunti, respectively, are justly titled and contain additional miscellaneous diocesan information. Subseries XII, XIII, and XIV, titled Societa segrete, Societa, and Societa cattolica, respectively, contain information on both diocesan and national organizations. It is possible to find the same organization in more than one of these series. Subseries XV, Greci-Orientali, contains information as to the acceptance of Oriental Rite parishes in U.S. dioceses and cases involving Oriental Rite priets and lay people. Subseries XVI, Stravaganti, regards cases involving priests without dioceses in the U.S. and Canada. Subseries XVII, Universita Cattolica, concerns that institution, as subseries XXI, Collegio Giuseppino, regards the Pontificium Collegium Josephinum de Propaganda Fide in Cincinnati, Ohio. Subseries XVIII, Ruteni, deals with the establishment of a diocese for Greek Orthodox Rite Russians in the U.S. There is much information on the relationship between Greek and Latin rite priests and bishops and Greek and other Oriental Rite Catholics in general. Suberies XIX, Instituti Religiosi, concerns the variety of issues faced by religious orders, particularly regarding their sponsorship of educational institutions. Subseries XX, Finanze, covers a variety of economic issues from the support of the Apostolic Delegate and to the financing of the "colored" missions.
