World War III: The Empire of the Setting Sun- June 1959- the USA, in the interim between 1956 and 1959, has managed to ascend to superpower status (with new weapons such as the Abrams tank, The Harrier and F-14 Tomcat Jets, Cobra helicopter and many more weapons including the A-10 thunderbolt and a new intercontinental bomber in the works), and many in Germany and Japan fear that they could fall, since the devastating Reich-Japan war. What makes it worse is that the Axis is cut in two, by the fact that the USA covers all of the Americas and rebellions are taking place in the area around the Urals. Germany suffers the most, since SJ-53 spreads into the Reich, literally decimating its population, and leaving vast areas depopulated. Meanwhile, the USA has much better standards of life since the "Jim Crow" laws were all immediately repealed when Castro came to power.
Acting president Fidel Castro (who led the US resistance and never became in involved in communism as in OTL), declares war on Japan, knowing that Germany will be too busy rebuilding after the devastating war to help Japan. At first, the Japanese are very resistant to the US forces, pushing them into Alaska, but give way in Siberia by February 1960, and the (US-friendly of course) New Soviet Union is established. The 26th US marines battalion famously breaches the great wall by the end of December 1961. Meanwhile in the Japanese Empire, resistance movements motivated by the American invasion rise up, inciting slave revolts among the Chinese and the Filipinos. The Japanese, regardless of overstretch, begin the long brutal retreat to the main Japanese islands for a last stand.
American forces link up with the rebels and by May 1962, the Coalition liberated Peking after a long and bloody battle which cost nearly half a million lives. Meanwhile, the riots were beginning to spread in Myanmar and the rest of south east Asia, so the Japanese military were forced to abandon them. On July 8, 1963, the Japanese emperor, realizing the futility of continued struggle, tells his chiefs of staff that he plans to surrender. The military takes control and execute him and place a militaristic puppet on the throne instead, who vows on Japanese TV to fight to the very end. So the Coalition begin the arduous struggle to Tokyo, which took 2 years, due to the Japanese resistance. In 1965, the Japanese Chiefs of staff are captured in Tokyo, while they were trying to flee. They are put on trial and executed for their crimes. While the Coalition mop up the last pockets of resistance, a moderate Japanese emperor surrenders unconditionally. In the treaty of Sapporo, Hawaii and the Philippines are returned to America, while Japan is forced to pay reparations mounting to quadrillions of US dollars to the countries she enslaved, their land is reduced to the four main Japanese islands, and is to be occupied by American soldiers and is banned from having any military whatsoever, all of which are rigorously enforced.
Meanwhile, The German Reich is scared about this, as resistance movements spread across the German Reich, causing their ruined armies to become overstretched, and they rightly fear that they will be next...