Flag of the United Kingdom.svg (1)

The United Kingdom, commonly known as Great Britain, was the largest empire in history and encompassed 1/4 of the world's landmass. The UK fought with France, Russia and (after 1917) the United States, against the Central Powers in World War I. The UK armed forces were engaged across much of the British Empire and in several regions of Europe, particularly on the Western front. The UK had many self governing nations such as Canada, Australia, New Zealand and South Africa who likewise fought against Germany and its allies.