The lack of a Cold War is one reason why there is no space race. Japan, unlike the Soviet Union, is not trying to replace Capitalism with its own system. Japan's Imperial Government is not very revolutionary, and there are no non-Japanese that want to live under Japanese rule, the brutal occupation of many conquered countries in the Empire of Japan has seen to that. The Empire does not see the means to take over the World, being ruled by Japan under the Japanese Empire lacks the appeal that International Socialism has. I doubt there are many in Latin America who would wish to live under the Japanese, no matter how much they may detest the "Yanquis Imperialists" or "Yanquis Colonialism" because the Japanese brand is so much more worse and brutal. Japanese ideology doesn't spread much further than Japan and what the Japanese military can impose, for a Japanese citizen its great, but for everyone else, no dice. Nuclear Weapons has basically halted the Expansion of the Japanese "Coprosperity Sphere" as the Empire is euphemistically called. There is not much the Japanese can do militarily except consolidate its Second Great War Gains and build the economy of its Empire. I think the Japanese Empire would be ruthlessly Capitalistic, at least for the non-Japanese subjects, there would be Chinese factory workers in Manchuria building "Japanese Cars" for low wages initially, but those low wages by Chinese standards would be pretty good and a better deal than working on the farm out in the country side. The Japanese Economic program would rapidly expand the whole Japanese Sphere, not just Japan itself, probably over the next 4 to 5 decades, it would raise substantially the standard of living of many a Chinese or Filipino subject as well as proper Japanese citizens. Calls for socialism in the provinces would go unheeded, or bring on a crackdown as revolutionary socialism would be seen by the Japanese as a threat to the Emperor's rule. So the Japanese economic policies have been shown to work OTU, so in this timeline they would probably be applied over the whole Empire, bringing on a much higher standard of living, probably more equal to the United States because of its greater population of conquered subjects than in OTU. What would the population be of the Japanese Empire anyway? That is Japan plus all that it conquered in the Second Great War. I think if you add in part of China and the Phillipeans, that is a lot of people building cars and television sets.