Ka kammala wannan magana: A lokacin mulkinsa na shekara 10, Prieto ya faɗaɗa ikon gwamnati kuma ya kafa tushen gwamnati a Chile. An kafa cibiyoyin ilimi na farko kamar "Instituto Nacional" kuma a cikin 1837 an kirkiro ma'aikatun shari'a da ilimin jama'a. Manufofin kasashen waje na Prieto sun mamaye Chile
yaƙi da Peru tsakanin 1836 da 1839. Sojojin Chile a karkashin Manuel Blanco Encalada sun sha wahala sosai, wanda ya kai ga yarjejeniyar Paucarpata, bayan da Manuel Bulnes ya karbi jagorancin sojojin kuma ya jagoranci shi cikin nasarar Yakin Yungay.