The United Kingdom, until it leaves the European Union and moves behind Canada and Australia.
You can't be serious.
Actually, in its current rudderless state, the UK may go through a period where it is unable to exert influence in world affairs to nearly its potential. So no, it's not ridiculous to say that such a thing could happen, at least for a period of time.
At present, the UK is more powerful and influential than even a combined Canada and Australia, let alone either considered individually. Even if reduced to only England, it will remain No. 2 in the Anglophone world for at least the rest of this half century under any circumstances whatsoever. If Britain remains united, it's status as No. 2 is guaranteed for this century.
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