George V was King of The United Kingdom of Great Britain and Northern Ireland (not the King of England) from 6 May 1910 to 20 January 1936 which encompassed the whole of World War I.
England is a part of, but not the same as, The United Kingdom; there has not been a King (or Queen) of England for over 300 years.
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King George V
King George the 5th.
It was the Archduke of Austria-Hungary, not England, who was assassinated by Serbian nationalists in Sarejevo, Bosnia.
England had a king, King George III
It was because of the air raids on England during WW1.
Windsor. It was changed from a German name during WW1.
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King George III
king george the third
Lord King James
King George III was king of the United Kingdom (which includes England).