Map of the World showing the British Empire highlighted in red, London, 1886.

United Kingdom: Map of the World showing the British Empire highlighted in red, London, 1886. The British Empire comprised the dominions, colonies, protectorates, mandates and other territories ruled or administered by the United Kingdom. It originated with the overseas colonies and trading posts established by England in the late 16th and early 17th centuries. At its height, it was the largest empire in history and, for over a century, was the foremost global power. (Photo by: Pictures From History/Universal Images Group via Getty Images)