Me too, but my professor said that, that was a surprise to him too. I have searched about this and this is rare, because Argentina was not unified like today countries, but the states has a great autonomy.
Here in Brazil was not different, the Local Elites haved a bit autonomy and the Emperor was deal with them making promisses and giving them royal titles ( Baron, Viscount, etc. )
If we use today admnistration system to 1860s system, we will have trouble, because the information was by letter and the Telegraphs was started to be used slowly
Its like the fact that Brazil in 1860 had only 24.000 soldiers in Rio de Janeiro, because the rest of the territory use local militias ( Guarda Nacional )