This was necessary because when the first copies of this edition arrived in the country at the end of 1870, President Domingo Faustino Sarmiento's opposition took advantage of the modifications in the legal code sanctioned by Congress to initiate a media campaign against the government. For this reason Victorino de la Plaza and Aurelio Prado were appointed to compare both versions and report on the existing differences. While they were doing so, on January 1, 1871 President Sarmiento's decree declared the Buenos Aires edition to be official.