1. The criterion used to categorize a subnational government as regional is a population of 150 000, which follows the dividing line between regional and local government used in nomenclature d'unités territoriales statistiques. It is a geocode standard for referencing the administrative divisions of countries for statistical purposes. We loosen this criterion for special autonomous regions, such as Greenland. When we write that a ‘constitution enumerates federal legislative powers in trade and commerce’ we are using the term ‘powers’ to refer to formal authority. This convention is common in constitutions.
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