Rubuta ci gaba don wannan sakin layi - A lokacin mulkinsa na shekaru 10, Prieto ya fadada ikon gwamnati kuma ya kafa harsashin ginin 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 yakin da Chile ta yi 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.