The nation of Argentina had finally come together with the uniting of the city of Buenos Aires with the rest of the country, Domingo Faustino Sarmiento and Bartolomé Mitre were still alive, and Buenos Aires was striving to become the "Queen City" of South America.
Argentina achieved national unity by merging the city of Buenos Aires with the rest of the country.  Domingo Faustino Sarmiento and Bartolomé Mitre were still alive during this period, and Buenos Aires was aiming to become the leading metropolis in South America.