federalism vs regionalism

federalism

noun
  • A system of national government in which power is divided between a central authority and a number of regions with delimited self-governing authority. 

  • Covenantalism. 

  • The belief that such a system is superior to other forms of government. 

regionalism

noun
  • The belief that most or nearly all political power should be decentralized to regional governments. 

  • Affection, often excessive, for one's own region and to everything related to it. 

  • A word or phrase originating in, characteristic of, or limited to a region. 

How often have the words federalism and regionalism occurred in a corpus of books? (source: Google Ngram Viewer )