▁to ▁prevent ▁the ▁work ▁of ▁the ▁Assembly , ▁but ▁failed . ▁The ▁Argent ine ▁Constitution ▁of ▁ 1 8 5 3 ▁was ▁san ction ed ▁on ▁May ▁ 1 , ▁ 1 8 5 3 , ▁inv iting ▁Buenos ▁Aires ▁to ▁return . ▁Buenos ▁Aires ▁wrote ▁its ▁own ▁constitution ▁in ▁ 1 8 5 4 . ▁Both ▁countries , ▁the ▁Confeder ation ▁and ▁the ▁State ▁of ▁Buenos ▁Aires , ▁accepted ▁the ▁status ▁qu o , ▁with ▁a ▁serious ▁danger ▁of ▁the ▁se cess ion ▁becoming ▁permanent . ▁ ▁The ▁Confeder ation ▁attacked ▁Buenos ▁Aires ▁in ▁ 1 8 5 6 , ▁led ▁by ▁Jer ón imo ▁Costa , ▁who ▁was ▁defeated ▁by ▁Bart ol om é ▁Mit re . ▁Mit re ▁got ▁ 1 4 0 ▁prisoners : ▁he ▁executed ▁ 1 2 5 ▁of ▁them . ▁ ▁in ▁ 1 8 5 7 , ▁Mit re ▁and ▁other ▁polit icians ▁in ▁Buenos ▁Aires ▁considered ▁making ▁the ▁se cess ion ▁a ▁definit ive ▁one , ▁ren aming ▁the ▁state ▁to ▁the ▁" Rep ublic ▁of ▁the ▁Río ▁de ▁la ▁Pl ata ". ▁The ▁project ▁was ▁resist ed ▁by ▁Dom ingo ▁Fa ust ino ▁S arm iento , ▁who ▁began ▁his ▁conflicts ▁with ▁Mit re . ▁The ▁project ▁did ▁not ▁find ▁popular ▁support , ▁and ▁was ▁forgotten . ▁ ▁The ▁Confeder ation ▁had ▁a ▁political ▁comm otion ▁with ▁the ▁murder ▁of ▁Naz ario ▁Ben av í de z , ▁from ▁San ▁Juan , ▁carried ▁out ▁by ▁supp or ters ▁of ▁S arm iento .