In the Spanish legal system, the distribution of power between the State and the Autonomous Communities causes some deficiencies in the care of unaccompanied foreign minors. While migration control and the identification of unaccompanied alien children are the State's responsibility, through the intervention of the Public Prosecutor's Office, the guardianship of these minors, their care, and protection are the responsibility of the Autonomous Communities. And not all the Autonomous Communities have the same degree of responsibility: southern border regions (the Canary Islands and Andalusia, with the autonomous cities of Ceuta and Melilla) assume the guardianship of most of the minors. In such a model, inter-territorial coordination and mutual solidarity should be essential principles of operation. But in practice, this is not the case. This paper will highlight these problems and possible solutions.