Pax Americana

 
Pronunciation: /ˌpaks əmɛrɪˈkɑːnə/
(also Pax Britannica /brɪˈtanɪkə/)

noun

[mass noun]
  • a state of relative international peace regarded as overseen by the US (or the UK).

Origin:

late 19th century: Latin, literally 'American peace', after Pax Romana