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Very simple - the UK is the United Kingdom, formed 1707 by a union of the Kingdoms of England and Scotland, hence the incorporation of both their national flags. In 1801 the Kingdom of Ireland was added and the flag was changed accordingly. Wales was a principality of England and not an independent polity (hasn't been since the 13th century barring a brief period of independence for Gwynedd under Owain Glyndwr in the early 1400s). Ergo, it is not featured on the flag.
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