can you name any 3 countries that were under their empire?
China, Argentina and Siam
British Empire
 Britain's dominant position in world trade meant that it effectively controlled the economies of many countries, such as China, Argentina and Siam, which has been described by some historians as an "Informal Empire".
what is the british empire? The Empire that comprised the dominions, colonies, protectorates, mandates, and other territories ruled or administered by the United Kingdom and its predecessor states.
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British Empire [SEP] Britain's imperial century (1815–1914)
Between 1815 and 1914, a period referred to as Britain's "imperial century" by some historians, around of territory and roughly 400 million people were added to the British Empire. Victory over Napoleon left Britain without any serious international rival, other than Russia in Central Asia. Unchallenged at sea, Britain adopted the role of global policeman, a state of affairs later known as the "Pax Britannica", and a foreign policy of "splendid isolation". Alongside the formal control it exerted over its own colonies, Britain's dominant position in world trade meant that it effectively controlled the economies of many countries, such as China, Argentina and Siam, which has been described by some historians as an "Informal Empire".