Por qué razones la Primera Junta fue sustituida por la Junta Grande a fines de 1810?

The Primera Junta or First Assembly is the most common name given to the first independent government of Argentina. It was created on 25 May 1810, as a result of the events of the May Revolution. The Junta initially had representatives from only Buenos Aires. When it was expanded, as expected, with the addition of the representatives from the other cities of the Viceroyalty of the Río de la Plata, it became popularly known instead as the Junta Grande (Grand Council). The Junta operated at El Fuerte (the fort, where the modern Casa Rosada stands), which had been used since 1776 as a residence by the Viceroys.

Explanation:

the answer is chorales.