agency vs trust territory

agency

noun
  • A department or other administrative unit of a government; also, the office or headquarters of, or the district administered by such unit of government. 

  • A medium through which power is exerted or an end is achieved. 

  • The capacity, condition, or state of acting or of exerting power. 

  • An establishment engaged in doing business for another; also, the place of business or the district of such an agency. 

  • The office or function of an agent; also, the relationship between a principal and that person's agent. 

  • The capacity of individuals to act independently and to make their own free choices. 

trust territory

noun
  • a territory placed under the administration of a state by the United Nations 

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