jan 1, 1801 - Acts of Union (1800)

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The Acts of Union 1800 were parallel acts of the Parliament of Great Britain and the Parliament of Ireland which united the Kingdom of Great Britain and the Kingdom of Ireland (previously in personal union) to create the United Kingdom of Great Britain and Ireland.

The acts came into force on 1 January 1801, and the merged Parliament of the United Kingdom had its first meeting on 22 January 1801.

https://en.wikipedia.org/wiki/Acts_of_Union_1800

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