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Northern Ireland is one of the four countries of the United Kingdom, situated in the north-east of the island of Ireland. It was created as a separate legal entity on 3 May 1921, under the Government of Ireland Act 1920. The new autonomous Northern Ireland was formed from six of the nine counties of Ulster: four counties with unionist majorities – Antrim, Armagh, Down, and Londonderry – and two counties with slight Irish nationalist majorities – Fermanagh and Tyrone – in the 1918 General Election. The remaining three Ulster counties with larger nationalist majorities were not included. In large part unionists, at least in the north-east, supported its creation while nationalists were opposed. The Troubles in Northern Ireland (1920–1922) were followed by decades of relatively peaceful rule by the Ulster Unionist Party-controlled government of Northern Ireland (1921–1972), interrupted by Luftwaffe attacks during World War II. Systemic discrimination against Catholics by the government ensured a high emigration rate from that community and contributed to its continued dislike of the partition of Ireland. The Troubles erupted in the late 1960s, and continued until the 1998 Belfast Agreement.