The first constitutional amendment to the original 1853 text occurred in 1860 after Buenos Aires rejoined the Argentine Confederation. It consisted of changes to many of the original articles. One of the major changes was the renaming of the state: according to the reform, the country would be officially named "República Argentina" ("Argentine Republic") and, for legal purposes, "Nación Argentina" ("Argentine Nation"), replacing the older "Argentine Confederation" in all articles of the constitution. Another important inclusion was the constitutional recognition of Buenos Aires' exclusive rights guaranteed by the Treaty of San Nicolás.