Ireland, meanwhile, had effectively been an English colony since the 12th century, and after the emergence of Great Britain, it remained under the influence of the British crown. In 1801 it formally joined with Great Britain as a single political entity, which became known as the United Kingdom of Great Britain and Ireland—or the United Kingdom for short. However, the union lasted only until 1922, when Ireland (with the exception of six counties in the north) seceded. Ireland soon became a sovereign republic, and its former partner took on the official name of the United Kingdom of Great Britain and Northern Ireland.
Great Britain, therefore, is a geographic term referring to the island also known simply as Britain. It’s also a political term for the part of the United Kingdom made up of England, Scotland, and Wales (including the outlying islands that they administer, such as the Isle of Wight). United Kingdom, on the other hand, is purely a political term: it’s the independent country that encompasses all of Great Britain and the region now called Northern Ireland.
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