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