Hidalgo is a Protectorate under the rule of La Sindicación ("La Sín"), as part of the terms of El Pacto de Plata. It was taken from United States of America in Second Mexican-American War ("La Reconquista"). The Mexican government itself has mostly nominal rule here.
La Sin is not doing a great job of ruling by anyone's measure but theirs. La Sin rules with an iron fist, or they abdicate completely if it serves them. Areas are variously abandoned, anarchic, or a favorite target for the cartel's wrath. The state here does not so much have a monopoly on violence, they're just the top dog.
Large numbers of migrants have moved north from Mexico & Central America, if for no other reason than their environment becoming largely uninhabitable.