So here are my predictions for the Big Three of the post SGW world, Japan, USA and Germany.
The United States: Badly damaged by war and overburdened by holding down their conquered territories find its economy badly shaken and damaged. Would later attempt deporting their defeated enemies in masses. With Mormons to the Sandwich islands and Confederates & Canadians to South Africa. This would prove ineffective and would be cancelled but not before deporting nearly the entire Utah Mormon population to the sandwich isles, along with several million Confederates and Canadians to South Africa. Worsening the already poor relations. Would experiment with the collectivization of agriculture and industry around the 60's or 70's and universal social wealth fair only to fail horribly. Along with driving off private investment and industry. Eventually by the 90's or 2000's the United States would see the break up of a various number of it's occupied territories, though a decent amount still remain in the Union. By the new teen's the US would be ran by a collection of oligarchs under a democratic veneer. With a former member of the secret police becoming president and running the country with near dictorial control.
Japan: Enters into a golden age of prosperity, following SGW. With their country sparred from any direct fighting, control of the vast resources of Asia and a massive hostage market the country experiences unparalleled prosperity for the next twenty years. But would experience "Atomic terror" terrified of their country coming nuclear attack by the United States and to a lesser extent Germany. The economy experiences a major recession during the 70's or 80's, due to an oil crisis. Would become the worlds top hyper power following the American break up. Would experience slight economic issues has their client states and mainland territories begin demanding greater autonomy and workers rights. Their culture has become a major influence on the modern world. With samurai films being mainstay of any self respecting movie theatre. The "Iced War" is still going on with their rival Germany. One of the major issues currently facing them in the modern day is the influx of Russian and American workers. With oppents claiming that the immigrants are stealing their jobs.
Germany: Was badly damaged in SHE, taking nearly a generation to recover. Balkanized Frange after the war and took bloody revenge against their defeated foes for all the destruction they caused, in the form of harsh reparations, balkaniztion and even forced labor, with France receiving the worst treatment. Their was large scale emigration from their war torn eastern European client states to their colony of MittalAfrika. Preventing decolonization and leading to a steep divide between the European (Poles, Ukrainians, Lithuanians, Belarusians, Germans, Hungarians etc.) settlers and the native Africans. With Africans suffering segregation, jobs restrictions, denial of representation, lack of education etc. Would absorb the collapsing Austro-Hungarian Empire and the Baltic nations into the Greater European Federation, which many consider a mere extension of the German Empire. Peace was brutally enforced throughout Europe, with various troublesome groups getting deported and dispersed throughout the colonies. Would experience an era of democratic reforms during the late 90's, with the Kaiser and militaries power greatly being reduced. Their biggest allies are South Africa, The Ottoman Empire and West Russia. Currently is competing against Japan in the international market and dealing with French Unification terrorists. Along with working with the US on a joint man mission to Mars. A major issue is centered around modern MittalAfrica with the natives demanding greater representation and the future likelihood of Liberian backed terrorists in the colony.