British Isles, which today is called the United Kingdom. Wales was annexed by England by the Laws in Wales Acts 1535–1542, which incorporated Wales into the English state. A new British identity was subsequently developed when James VI of Scotland became James I of England as well, and expressed the desire to be known as the monarch of Britain.
In 1707, England formed a union with Scotland by passing an Act of Union in March 1707 that ratified the Treaty of Union. The Parliament of Scotland had previously passed its own Act of Union, so the Kingdom of Great Britain was born on 1 May 1707. In 1801, another Act of Union formed a union between the Kingdom of Great Britain and the Kingdom of Ireland, creating the United Kingdom of Great Britain and Ireland.
In 1922, about two thirds of the Irish population (those who lived in
twenty-six of the thirty-two counties of Ireland), left the United
Kingdom to form the Irish Free State.
The remainder became the United Kingdom of Great Britain and Northern
Ireland, although this name was not introduced until 1927, after some
years in which the term "United Kingdom" had been little used.
Throughout the history of the UK, the English have been dominant in
population and in political weight. As a consequence, notions of
'Englishness' and 'Britishness' are often very similar. At the same
time, after the Union of 1707, the English, along with the other peoples
of the British Isles, have been encouraged to think of themselves as
British rather than to identify themselves with the constituent nations.