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 Civil Rights Association
Since Northern Ireland's creation in 1922, the Catholic minority had suffered from varying degrees of discrimination from the Protestant and Unionist majority. Many nationalist historians regard the ethos of Northern Ireland as unambiguously sectarian, however, academic and author Senia Paseta posits that discrimination was never as calculated as republicans maintained nor as fictional as unionists claimed.