AH Challange, form an Anglo-American alliance within this timeframe ...

What kind of scenario would force the development and survival of an Anglo state alliance (containing AU, NZ, Can, UK, USA) to the present day. The time frame is that it has to develop POST 1918 and survive. Bonus points if you get Ireland in as well (not just NI). What kind of counter actions would certain states take and look like? How would British African and Asian colonies develop over time? What is lone term consequences of such an alliance be on the USSR (in regard to no NATO), China (Hong Kong issues) and Japan?
 
The postwar revolutionary wave is much more successful and all/most of Continental Europe is united in a revolutionary bloc. The British Empire is able to weather the storm and forms an alliance with the US to counterbalance the rising red tide.
 
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