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.
Partition of Ireland
In 1966 the Taoiseach Seán Lemass visited Northern Ireland in secrecy, leading to a return visit to Dublin by Terence O'Neill; it had taken four decades to achieve such a simple meeting. The impact was further reduced when both countries joined the European Economic Community in 1973. With the onset of The Troubles (1969–98) a 1973 referendum showed that a majority of the electorate in Northern Ireland did want to continue the link to Britain as expected, but the referendum was boycotted by Nationalist voters.