During the Age of Sail and the Age of Colonization, the British formed a massive seafaring and colonial empire through exploration, trade and rapid colonization. Large swathes of land were immediately seized for the English Crown, and these acquisitions allowed the Empire to become one of the largest superstate powers on Earth.
In 1807, slavery was outlawed in the Commonwealth, and effectively the rest of the world as well, cutting off most of the supply of slaves, and all of the supply of Anthro-feralis slaves to the United States.
Throughout the late 19th century and 20th century, many state under English governance slowly shifted towards self-governance and were eventually granted independence.
In 1949, the London Declaration declared all former governed territories outside the United Kingdom, with the exception of Australia and New Zealand, to be 'free and equal', ending direct British control over almost all members within the Commonwealth.
Hong Kong was released from British control in 1998, and became its own autonomous, independent state that still retains Commonwealth membership to discourage Chinese attempts at annexation.
At its height, the British Empire was massive enough to span the entire globe to the point where the empire as a whole never completely saw the darkness of night, thus granting the phrase "The sun never sets on the British Empire."
Most states within the Empire formed their own local governments.