On April 15, 1815, a revolution ended the mandate of Carlos María de Alvear as Supreme Director and demanded that a General Congress be summoned. Delegate deputies, each representing 14,000 inhabitants, were sent from all the United Provinces of the Río de la Plata to the sessions, which started on March 24, 1816. However, the Federal League Provinces did not send delegates: the Argentine littoral Provinces (Santa Fé, Entre Ríos, Corrientes and Misiones), and the Eastern Province (modern-day Uruguay).