There is some suggestion that the British government of the 1930s, possibly because of the growing power of the US, thought of the possiblity of allying with Germany and Japan and launching an attack on the USA.
The idea would of had lots of advantages for the UK - first of all, it would have meant that their Asian empire would have been safe from the Japanese (who subsequently took control of Hong Kong, Singapore and Burma) and they would have carved up the rest of the continent between them.
The situation with Germany would have been that Britain would have again taken control of the USA with the aid of Japan, while Germany would have become the dominant power in Europe and between them they would have ruled the world.
Of course today such an idea would have been unthinkable because of the "special relationship" between the UK and the US and because of how Hitler's Germany later turned out, but in the 1930s this was of course unknown - they even managed to host the Olympics in 1936 without arousing much suspiscion of what was going on in Germany, Neville Chamberlain also met Hitler in 1938 and declaired that Hitler had no bad intentions. Hitler would probably of agreed with this plan as he always thought of the British as a decent buch of chaps and wanted to get to the US because of the proportion of the population that was Jewish, it would also haved saved them a lot of trouble in Europe if the British didn't oppose them.
I would like to remind people on the forum that what I've said above isn't fictional, it could well have happened, but I believe it probably fell through because of the number of Jewish MPs in Britain. What do you think the world would be like if the agreement had gone through?