Like nemethand said I don't want to reply here but this is where the conversation is...
I feel that since my name was mentioned I should put my two cents in;
In short, Kensai's Japan has alienated every friend it could have possibly had. Obviously Russia and Germany will have natural animosity towards Japan for an unprovoked attack. Actually, this reminds me of a story I like to tell about the German Army that I read in a book by Max Boot*; during the Boxer Rebellion the Boxers stormed the Peking international district where the delegations from other nations were. The Boxers dragged the German ambassador from his house and decapitated him in the middle of the street. When the Eight Nation Alliance came, and sent a relief force to the delegation district, the German troops supposedly found the Boxers responsible, dragged them out to the street, and decapitated them. I see nothing wrong with a Germany that is still upset with Japan and would like revenge, and perhaps its old colony back.
Anyway, story time over.
Japan alienated its only friend in the USA by saying that the USA "abandoned" Japan because the USA didn't also declare war on Germany and Russia, even though I never gave any such agreements. The USA offered to help negotiate a peace but was refused. The absence of negotiations before the war, or any attempt to purchase the lands also came off as very belligerent on Japan's part. I think the subsequent invasion of China was also a bad move, in terms of making enemies. Granted, China was AI and you couldn't negotiate, but a player could have been nominated to handle negotiations on behalf of an AI China, or a purchase deal. Remember, the USA was an ally of China, and would have probably been able to handle negotiations on behalf of the AI China. The USA didn't first respond to the invasion of China because the country
was AI, but as soon as a player took over we began negotiations for US help. It should be no surprise. Where you probably see a radically interventionist USA, I see a USA that has only ever honored defensive alliances, I see this largely because of the vacuum of sense left by glennbob's and whollaborg's Britains - of course everyone is entitled to their own opinions. With a strong (and sensible) Britain returning, "interventionist" USA as you see it is probably dead as long as its allies aren't attacked. It is also ironic you should want to stop supposed USA intervention of helping an ally who has occupied territory, with more intervention by nations with no prior DA's. I hope that explains USA's actions a little.
Currently the only supposed friend Japan has is Ojo's Spain. But that is only because you're objectives currently align. Of course, Spain and Mexico are allowed to try whatever they want, this is a game after all. The USA
does have significant forces in the Pacific, but not all of them... besides, like de_Spinoza says, you can't blame me for moving troops to where the fighting is. I would also like an attempted Mexican intervention, not only would it be a fun little war, but would allow the US to nab... perhaps... Veracruz?**

Not to mention the fact that the USA is allied with Austria, Britain, France, Denmark, and Belgium (I may be forgetting some), and is on great terms but not an official alliance with Brazil. America honored its alliances with all of these nations at one point or another, and all of these nations received help or direct aid from America in the past when they were under attack. I'm sure at least most of them haven't forgotten it and would in turn help America. I also have to thank Kensai's Japan for perhaps averting WWIII, by bringing at least Germany and the USA closer and removing barriers between the two.
*
Savage Wars of Peace - Small Wars and the Rise of American Power by Max Boot, I think that's what it was called, strongly recommend it...
**
http://en.wikipedia.org/wiki/US_occupation_of_Veracruz