https://en.wikipedia.org/wiki/Pax_Britannica
Pax Britannica (Latin for "British Peace", modelled after Pax Romana) was the period of relative peace between the Great Powers during which the British Empire became the global hegemonic power and adopted the role of a "global policeman".. Between 1815 and 1914, a period referred to as Britain's "imperial century", around 10,000,000 square miles (26,000,000 km 2) of territory …