When did Buenos Aires enact a centralist constitution ?
The Battle of Cepeda ( 1820 ) thwarted the goal of Buenos Aires leaders to govern the country under the Argentine Constitution of 1819 , and following a series of disorders and a short - lived Constitutional Republic led by Buenos Aires centralist Bernardino Rivadavia in 1826 and 1827 , the United Provinces established in 1810 again became divided , and the Province of Buenos Aires would emerge as the most powerful among the numerous semi-independent states .