I've just realised my fantastically imaginative piece (above) which is an embryonic Turtledove winner if there ever was one, has missed a couple of things.
The absence of WW2 and the rapprochement between Paris, London and Rome leads to an earlier economic and political convergence. In order to bolster the settlement in Spain, France and Italy form an economic free trade area (known pejoratively as the Catholic Pact). Belgium, Holland an Austria soon join but it takes off when Britain joins in 1940 under the new Halifax Government.
Economic convergence leads to defence and political cohesion - the Stresa Powers form the EDTO and take a single seat at the League of Nations which America doesn't join until the Robert Kennedy Presidency in the 1960s.
Prosperity in the 1950s and 1960s ensued as Germany began to shift from its militaristic status under the Nazis and the Generals to a more co-operative stance leading to the Hamburg Declaration in 1964 and the first full elections to the new Bundestag in 1966. The SPD win these and Brandt becomes Chancellor in 1970 pledging German accession to EDTO.
With Germany and the other central European states joining the European Economic Pact (EEP), deeper political integration was possible even as the last dictatorial holdout, Portugal, saw its own bloodless revolution in 1972.
Under Prime Minister Jenkins, the British Social Democratic Government moved the notion of full political union. It wasn't an easy journey for some states but on January 1st 1999, to much fanfare, the European Federation (or EuroFed) was born. Using a new currency, the florin, EuroFed was a well meaning if a little unfocussed.
While mainland Europe was at peace, there was, as ever, trouble on the peripheries. By extension, much of North Africa and the Middle East was part of EuroFed but both Russian and American agitation among nationalist and religious groups ensured the colonial powers had little peace. Indeed, from Morocco through Libya to Egypt and beyond to Palestine and Syria the region was often in tumult. American backed groups supporting self determination for the Arab and Berber peoples caused tension throughout the region in the 1950s and 1960s and this was combined with the issue of Turkish revanchism, the instability of Transjordan and of course Persia.
The British also had the thorny issue of India - since the rise of Gandhi, Indian calls for greater autonomy has continued and the Pan-Indian Congress Movement under the joint leadership of Nehru and Jinnah had published a manifesto calling for a full British withdrawal from India as early as 1948. With Washington backing calls for greater self-determination, the Conservative Governments of Eden and Hogg had moved only slowly but with the election of Jenkins and the Social Democrats ending 15 years of Conservative rule in 1970, the mood music changed. There was no repeat of the rapid and unplanned withdrawal of the Portuguese after the 1972 revolution which led to horrendous violence in Angola and Mozambique and led to South African forces occupying both countries.
Jenkins sent Lord Mountbatten and a League of Nations delegation to Delhi to broker a political deal and it proved an outstanding success. Queen Elizabeth II was able to declare an independent India on March 1st 1980. The "Mountbatten Model" as it came to be known, was copied by France, Italy and the other colonial powers in their dealings. It didn't always work but more often than not the transition to new democracies was smooth. Decolonialisation led to improved relations with Washington in the 80s and 90s as the various Caribbean Islands found themselves joining the League of Nations. We all remember the pictures of President Hart and Prince Charles trying their hand at reggae with Jamaica's first President, Robert Marley.
Yet for all the good news, Africa remains backward and behind. EDTO troops found themselves far from their usual theatre defending themselves against South African forces in Zambia and Congo. For a time in the 1960s and 70s, South Africa enjoyed an alliance with Washington especially under Republican Presidents but that ended with the election of Robert Kennedy in 1968 and the start of the twenty four years of Democrat rule. The Pretoria Government found itself isolated with only Japan left as a nominal ally and in the end isolation and military overreach took its toll. Trying to hold down resistance movements in Angola, Mozambique, Botswana and Rhodesia, the Pretoria Government had no answer when its own people rose in revolt. Out of the wreckage came the Pan-African Movement which spread through the continent in the 1990s and 2000s with a new message of ecology and egalitarianism.