Pedzisa mutsara unotevera: Rosas akatarisana nekutyisidzirwa kwakawanda kwesimba rake mukati memakore ekupedzisira e1830 uye kutanga kwe1840. Iye
akarwa hondo nePeru-Bolivian Confederation, akatsungirira kuvharirwa neFrance, akatarisana nekumukira mudunhu rake uye akarwa kupandukira kukuru kwakagara kwemakore uye kwakapararira kumatunhu akati wandei eArgentina. Rosas akaramba achiwedzera simba rake mumapurovhinzi, achivadzora zvakananga uye zvisina kunanga. Pakazosvika 1848, akanga awedzera simba rake kupfuura miganhu yeBuenos Aires uye akanga ari mutongi weArgentina yose. Rosas akaedzawo kubatanidza nyika dzaiva pedyo dzeUruguay neParaguay. France neGreat Britain pamwe chete vakatsiva kurwisa kweArgentina, vachivharira Buenos Aires kwechikamu chikuru chekupera kwema1840, asi vakatadza kumisa Rosas, ane mukurumbira wakawedzerwa zvikuru nekubudirira kwake.