The British Empire.

The British Empire was the empire consisting of Britain and the territories it controlled. It began in the early 1600's and peaked around the end of World War I, around 1920. At its height it included the British Isles, parts of the West Indies, Canada, Guyana, parts of West Africa, parts of East Africa, India, Australia, and New Zealand. (Princeton)

By 1815, Britain had become the dominant world power--it's power and wealth having been built on the slave trade and on the growing world demand for crops grown in British colonies, like sugar, tobacco, cotton, tea, and coffee. (George Mason University)