Portal:Argentina/Anniversaries/May/May 21

• 1534: Pedro de Mendoza is appointed adelantado of the Río de la Plata
• 1810: Viceroy Baltasar Hidalgo de Cisneros calls for an open cabildo
• 1813: The Assembly of the Year XIII abolishes nobility titles and torture
• 1903: Birth of de facto president Pedro Eugenio Aramburu