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1916 Easter Uprising
Easter Rising: The Irish Republican Brotherhood led an action which seized key government buildings in Dublin, and issued the Proclamation of the Irish Republic. http://www.bbc.com/news/uk-northern-ireland-35873316 -
The leaders of the uprising order their men to surrender
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The Constitution of Ireland comes into force replacing the Irish Free State with a new state called "'Éire', or, in the English language, 'Ireland'"