section_path: Studies, rankings, and periods/Long periods
section_name: Long periods
paragraph_text: Long periods
  
  The longest continuing period of peace and neutrality among currently existing states is observed in Sweden since 1814 and in Switzerland, which has had an official policy of neutrality since 1815. This was made possible partly by the periods of relative peace in Europe and the world known as Pax Britannica (1815–1914), Pax Europaea / Pax Americana (since 1950s), and Pax Atomica (also since the 1950s).
  
  Other examples of long periods of peace are: