Pedzisa mutsara unotevera: Munguva yake yokutonga kwemakore gumi, Prieto akawedzera simba rehurumende ndokuvaka hwaro hwehurumende muChile. Nzvimbo dzokutanga dzokudzidzisa dzakadai se"Instituto Nacional" dzakavambwa uye muna 1837 hurumende dzezvemitemo nedzokudzidzisa vanhu dzakasikwa. Mutemo wokunze waPrieto waidzorwa neChile's
hondo nePeru pakati pa1836 na1839. Mauto eChilean pasi paManuel Blanco Encalada akatambura kurasikirwa kukuru, uko kwakaguma muChibvumirano chePaucarpata, mushure mezvo Manuel Bulnes akatora hutungamiriri hweuto uye akaitungamira muhondo yekukunda yeYungay.