The United Kingdom is one of only two countries without a national day, but the Kingdom officially came together in what year?

The entirety of Ireland joined with Great Britain in 1801, becoming the United Kingdom of Great Britain and Ireland. But the love was short-lived...at least for half the country. In 1922, the south of Ireland seceded and is now known as the Republic of Ireland, while six counties in the north of the country remained with Great Britain.

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