He enrolled at the University of Buenos Aires Law School, earning a juris doctor, and in 1880 married Carmen García Lara, with whom he had one daughter.
Carranza, during the late 1880s, developed a correspondence with numerous relatives of key figures and veterans of the Argentine War of Independence.
He collected a wide variety of vintage weapons, documents, memorabilia, furniture and other items related to the 1810 — 21 struggle, and was later given purview over similar artifacts already on display at the Museo Público.
[3] Carranza initially operated the museum jointly with a commission led by former Presidents Bartolomé Mitre, Julio Roca, and other members of the National Academy of History of Argentina, which he joined in 1901.
[3] A professional historian, he authored numerous works on the fitful history of Argentina, including Hojas históricas (1893), Leyendas Nacionales (1894), and San Martín (y su correspondencia), a 1905 anthology of the Liberator's correspondence.