Their Finest Century

Great Britain comes out of the war as a superpower. 
One way this could happen is that Churchill and de Gaulle’s (historical!) offer of “an indissoluble union” of the French and British people eventually results in the E.U. becoming an unambiguously British-led superstate.
Earlier historical changes based several schemes to integrate the overseas Dominions into a true union with Great Britain is another option.
==References==
* Weird War II-21
Category:Divergent History Suggestions