Camargo established himself as a historian during the Getúlio Vargas era (1930–1945), including the Estado Novo [New State] period when the Church regained its central role in power, lost since the late 19th century. His most productive years, marked by his most influential works, were between 1945 and 1955. In 1955, the International Eucharistic Congress was held in Rio de Janeiro. This year also marked an important turning point for internal Church politics, with the creation of the Conselho Episcopal Latino Americano [Episcopal Conference of Latin America] (CELAM). This, in turn, paved the way for the establishment of the Comisión para Estudios de La Historia de La Iglesia en América Latina [Commission for the Study of Church History in Latin America] (CEHILA) , which from the 1970s onwards advocated for a more critical historiographical approach. This approach focused on the experiences of ordinary people, challenging the traditional, apologetic histories that emphasised prominent figures and events while concealing internal Church conflicts (E. Dussel, Historia de la Iglesia ..., 1972).

Active bibliography: Polyanthea em Homenagem ao Tricentenário da criação do Município de Parnahyba, 14 de Novembro 1625/14 de Novembro de 1925, São Paulo, 1925; Notas para a História de Parnahyba, Officinas Graphicas da “Ave Maria”, São Paulo, 1935; História de Santana de Parnaíba . São Paulo, Governo do Estado de São Paulo, 1971; Igreja na história de São Paulo. Instituto Paulista de História e Arte Religiosa, São Paulo, 1952. v. 1. 1530-1624; v. 2. 1624-1676; v. 3. 1676-1745; v. 4. 1745-1771; v. 5. 1771-1821; v.6

1821-1851; v. 7. 1851-1861; Tibiriçá: sua época e os primeiros povoadores de São Paulo. Itu (SP): Ottoni, 2011. A instalação do Bispado de São Paulo e seu primeiro bispo, São Paulo, 1945. Anchieta e o Clero In: Anchietana / org. Comissão Nacional para as Comemorações do Dia de Anchieta ; introd. Julio de Mesquita Filho. - São Paulo, 1965, pp. 391-404.

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