Republic of Ireland–United Kingdom border
Originally intended as an internal boundary within the United Kingdom of Great Britain and Ireland, the border was created in 1921 under the United Kingdom Parliament's Government of Ireland Act 1920. Prior to this, a separatist Irish parliament had been established in Dublin, which did not recognise the Government of Ireland Act, and was actively engaged in the Irish War of Independence. The Act was intended to deliver Home Rule in Ireland, with separate parliaments for Southern Ireland (which included three of the nine counties of Ulster) and Northern Ireland. Six of the thirty-two counties of Ireland were assigned to Northern Ireland, and the rest of Ireland comprising 26 counties to Southern Ireland.
Northern Ireland
Unlike England, Scotland and Wales, Northern Ireland has no history of being an independent country or of being a nation in its own right. Some writers describe the United Kingdom as being made up of three countries and one province or point out the difficulties with calling Northern Ireland a country. Authors writing specifically about Northern Ireland dismiss the idea that Northern Ireland is a "country" in general terms, and draw contrasts in this respect with England, Scotland and Wales. Even for the period covering the first 50 years of Northern Ireland's existence, the term "country" is considered inappropriate by some political scientists on the basis that many decisions were still made in London. The absence of a distinct nation of Northern Ireland, separate within the island of Ireland, is also pointed out as being a problem with using the term and is in contrast to England, Scotland, and Wales.