Church and state are officially separated since 1916 in Uruguay. The religion with most followers in Montevideo is Roman Catholicism and has been so since the foundation of the city. The Roman Catholic Archdiocese of Montevideo was created as the Apostolic Vicariate of Montevideo in 1830. The vicariate was promoted to the Diocese of Montevideo on 13 July 1878. Pope Leo XIII elevated it to the rank of a metropolitan archdiocese on 14 April 1897. The new archdiocese became the Metropolitan of the suffragan sees of Canelones, Florida, Maldonado–Punta del Este, Melo, Mercedes, Minas, Salto, San José de Mayo, Tacuarembó.
Is there an answer to this question (If it cannot be answered, say "unanswerable"): When was the Roman Catholic Archdiocese of Montevideo created?
1830