Here is my attempt. I am not good at making maps, but I like the scenario I came up with, so I gave it a shot. The oddly colored borders are to identify the borders of conflict zones.
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Following German victory in the Great War in 1921, the British Empire refused to allow Germany to control any colonies and undertook the administration of her former allies colonies herself. The new, powerful Germany attempted to find colonies anyway, and rather than seeking a direct fight with Britain, attempted to seize unclaimed islands in the Pacific. This brought Germany into conflict with Japan, which, by 1931, was attempting to gain hegemony in the Pacific by conquering China. By 1936, however, Japan also wanted Pacific island in her Empire, and attacked Germany and the United States. However, also in 1936, a rebuild, modernized Russia was able to put aside the "Great Game" with Britain, who became allies against German hegemony in Europe. This created a complex situation, pitting two democracies against each other. However, before any direct conflict between the US and the UK could be fought, the war ended in a stalemate when Germany build the first atom bomb, forcing the allies to stop their advance. The British gained one shortly thereafter, and and forced the Americans to stop their assault on mainland Japan. In response, the US turned their attention to the Japanese Empire, and invaded China in 1942. By 1943, the USMC had linked up with the Nationalist army, and in 1944, the two nations signed a Security Treaty. However, although a stalemate ended the war, the tension did not end. The US, China, and Germany demanded the allies give their colonies self-determination. The allies refused.
By 2007, the Cold War between the Allies and the Entente has been going on for half a century, and fears that WWIII could start at any moment are ripe ever since both sides completed their missile shield programs around 2000. In 2002, the USA attempted to put a missile shield in Liberia, prompting the Seven Day War. Tensions have skyrocketed since.
The map below is a political map of the Cold War in 2007.
Allies:
Pink-British Empire
Orange-British Allies and Protectorates
Green-Russia
Entente:
Dark Green-USA
Grey-USA influenced/controlled
Dark Grey-Germany
Yellow-China
Black-Conflict zones