| United Kingdom of Great Britain and Ireland
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| Flag
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Coat of arms
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| The United Kingdom of Great Britain and Ireland (dark green) and the wider British Empire on the eve of World War I
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| Capital
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London
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| Official language
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English (official)
Irish
Welsh
Scots
Scottish Gaelic
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| Religion
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Church of England (England and Wales only)
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| Government
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Unitary parliamentary constitutional monarchy
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| Monarch
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| - 1801-1820
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George III
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| - 1820-1830
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George IV
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| - 1830-1837
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William IV
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| - 1837-1901
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Victoria
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| - 1901-1910
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Edward VII
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| - 1910-1919
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George V
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| Prime Minister
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| - 1801; 1804-1806
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William Pitt the Younger (first)
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| - 1918-1919
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Andrew Bonar Law (last)
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| History
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| - Acts of Union
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1 January 1801
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| - Irish Independence Act
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30 September 1919
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| Currency
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Pound sterling
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| Today part of
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 United Kingdom
Ireland
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