The article simultaneously explores three lines of reflection and analysis woven around the comparative reverberations (in space and time) between citizenship and the administration of populations (states of exception) in the Republic of Ecuador during the nineteenth century and the Kingdom of Spain in the twenty century. The first thread tries to answer the question whether it is possible for concepts generated in a country of the Global South to be used usefully in analyzing a different Northern reality, inverting the usual direction in the flows of transfer and importation of “theory.“ The second theme of comparative reverberation explores a network of concepts concerning the citizenship of common sense and the administration of populations, that is the “back-patio“ aspect of citizenship, particularly its historical formation in the domination of populations in the Republic of Ecuador during the nineteenth century. It is centered on the process of identification in the daily exchanges between interpares citizens and extrapares non-citizens. The last section involves testing concepts forged in the author's studies of Ecuadorian history for their utility in analyzing the current situation of modern sub-Saharan immigrants in Spain (using concrete examples), and their reclusion to the private sphere in spaces of exception and abandonment. Here, the article concentrates on the difference between the public administration of populations and the private administration of citizens. The article uses documentary material relating to nineteenth-century Ecuador and twentieth-century Spain and Senegal.