San Pedro, the second department of the country, was created by law in 1906, and had the territories of Itacurubí del Rosario, Santa Rosa del Aguaray, Tacuatí, Unión, Ygatimi and Curuguaty, as well as the area of the present Canindeyú department. Its limits were given finally by the Law 426 of 26 December 1973.