History of the formation of the United Kingdom Kingdom of England (which included Wales and controlled Ireland) and the Kingdom of Scotland. The once independent Principality of Wales fell under the control of English monarchs from the Statute of Rhuddlan in 1284. The Union of Crowns in 1603, the accidental consequence of a royal marriage one hundred years earlier, united the kingdoms in a personal union, though full political union in the form of the Kingdom of Great Britain required a Treaty of Union in 1706 and Acts of Union in 1707 (to ratify the Treaty). The Act of Union 1800 united the Kingdom of Great Britain with
Unionism in England Unionism in England In England, Unionism is a political ideology which favours the continuation of some form of political union between England and the other countries of the United Kingdom (Scotland, Wales and Northern Ireland). It is part of the wider British unionist movement and is closely linked to the notion of Britishness. Unionism in England is characterised by both opposition to England's independence as a separate state and the belief that Scotland, Wales and Northern Ireland should continue to be constituent countries of the Union. The political union between the Kingdoms of England (also including Wales as an English