Kammala jumla mai zuwa: Yaƙin Cepeda na 1820, wanda aka yi tsakanin Tsakiya da Tarayyar Tarayya, ya haifar da "ƙarshen mulkin Babban Daraktan". A cikin 1826 Buenos Aires ta kafa wata kundin tsarin mulki na tsakiya, tare da Bernardino Rivadavia da aka nada a matsayin shugaban farko na kasar. Koyaya, lardunan ciki ba da daɗewa ba suka tashi a kansa, suka tilasta masa yin murabus kuma suka yi watsi da kundin tsarin mulki. Centralists da Federalists sun ci gaba da yakin basasa; na biyun ya yi nasara kuma ya kafa Tarayyar Argentine a 1831, wanda Juan Manuel de Rosas ya jagoranta. A lokacin mulkinsa ya fuskanci takunkumin Faransa (1838<unk>1840), da
Yaƙin Confederation (1836<unk>1839), da haɗin haɗin Anglo-Faransa (1845<unk>1850), amma ya kasance ba a ci nasara ba kuma ya hana ƙarin asarar ƙasa. Manufofinsa na hana cinikayya, duk da haka, ya fusata lardunan ciki kuma a cikin 1852 Justo José de Urquiza, wani caudillo mai iko, ya doke shi daga mulki. A matsayin sabon shugaban Tarayyar, Urquiza ya kafa tsarin mulki na 1853 mai sassaucin ra'ayi da tarayya. Buenos Aires ya rabu amma an tilasta masa komawa cikin Tarayyar bayan an ci shi a cikin 1859 Battle of Cepeda.