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https://stairnaheireann.net/2016/04/18/1949-the-republic-of-ireland-withdraws-from-the-british-commonwealth-the-british-parliament-recognises-the-declaration-but-asserts-sovereignty-over-the-six-northern-counties-2/
1949 – The Republic of Ireland withdraws from the British Commonwealth. The British Parliament recognises the declaration but asserts sovereignty over the six northern counties