Question

when were United Kingdom and Ireland united? ​

Answer 1

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Union of Great Britain and Ireland

The British government's fear of an independent Ireland siding against them with the French resulted in the decision to unite the two countries. This was brought about by legislation in the parliaments of both kingdoms and came into effect on 1 January 1801.

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Answer 2

Answer:

$\huge\underline\mathfrak\green{1-Janauary-1801}$