The book "Question to the Master Marquis de Loreto, Viceroy and Captain-General of the Provinces of Rio de la Plata" written by Francisco de Viedma is a historical document that was published at the turn of the XVIII-XIX centuries. In his "Memory", the author addresses the viceroy with a detailed analysis of the state of affairs in the provinces of Rio de la Plata, highlights problems and proposals for improving the management and social development of these lands. Francisco de Viedma, as an experienced colonial administrator, proposed concrete measures aimed at improving economic conditions, social conditions and political stability in the region. In addition, he highlights important aspects of the life and activities of the colonists, discusses the issues of industrialization and the development of local infrastructure. This "Memory" is considered an important source for the study of the history of Latin America and the colonial era. The work contains a lot of interesting information about that period and can be useful to researchers of the history and culture of this region.