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Northern Ireland - Wikipedia
Why Is Ireland Two Countries? | Britannica - Encyclopedia Britannica
Northern Ireland | History, Population, Flag, Map, Capital, & Facts
Countries of the United Kingdom - Wikipedia
How Scotland, Wales and Northern Ireland Became a Part of the U.K.
History of Northern Ireland - Wikipedia
Brexit: How Northern Ireland is different - BBC
Brexit: How Northern Ireland is different - BBC News
Northern Ireland: 100 years since country was formed
Why is Northern Ireland part of the United Kingdom? - The Economist