city hall vs federalism

city hall

noun
  • The city government; government in general. 

  • The building that houses a city's government. 

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. 

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