▁Ur qu iza ▁defeated ▁Ros as ▁at ▁the ▁battle ▁of ▁Cas eros , ▁forcing ▁him ▁into ▁ex ile . ▁ ▁Sec ession ▁and ▁return ▁of ▁Buenos ▁Aires ▁ ▁Ur qu iza ▁was ▁not ▁a ▁un itar ian , ▁but ▁another ▁federal ist ▁like ▁Ros as . ▁Thus , ▁the ▁unit ari ans ▁did ▁not ▁support ▁him , ▁but ▁opposed ▁him ▁as ▁they ▁did ▁Ros as . ▁Ur qu iza ' s ▁amb ition ▁to ▁reduce ▁the ▁national ▁central ism ▁of ▁Buenos ▁Aires ▁and ▁promote ▁a ▁higher ▁federal ization ▁of ▁the ▁country ▁generated ▁conflicts ▁with ▁the ▁unit ari ans . ▁Ur qu iza ▁called ▁the ▁San ▁Nicol ás ▁Ag re ement , ▁so ▁that ▁all ▁provinces ▁agreed ▁to ▁conven e ▁the ▁ 1 8 5 3 ▁Const itu ent ▁Assembly . ▁This ▁was ▁resist ed ▁in ▁Buenos ▁Aires , ▁and ▁the ▁unit ari ans ▁took ▁advantage ▁of ▁a ▁temporary ▁absence ▁of ▁Ur qu iza ▁from ▁the ▁city ▁to ▁stage ▁the ▁Revolution ▁of ▁ 1 1 ▁September ▁and ▁se ced e ▁Buenos ▁Aires ▁from ▁the ▁conf eder ation . ▁It ▁was ▁now ▁the ▁State ▁of ▁Buenos ▁Aires , ▁and ▁the ▁other ▁Argent ine ▁provinces ▁were ▁now ▁the ▁Argent ine ▁Confeder ation . ▁ ▁Manuel ▁Gu ill ermo ▁P into ▁was ▁appointed ▁governor ▁of ▁Buenos ▁Aires , ▁and ▁removed ▁the ▁deleg ates ▁from ▁the ▁constitu ent ▁assembly . ▁The ▁capital ▁of ▁the ▁Confeder ation ▁was ▁now ▁located ▁in ▁Par an á , ▁Entre ▁R íos . ▁Buenos ▁Aires ▁attempted ▁military ▁actions ▁against ▁the ▁Confeder ation ,