Europe: Germany did get one event, there was an announcement that "Die Wacht am Rhein" happened to them. I thought I had a screenshot, but I didn't. (Why I referenced it in the writing). I didn't see any other events firing related to that, however. In some ways I think it would be better for Germany if winter happened a month or two later. If France penetrated far enough for Austria to join the war AND winter happened right at that point I think the French would be done for.
Asia: Heh. Strange things happen when you don't dictate what events fire when. But Japan does not want a war in China. Japan's still at war with Germany, George VIII, and Australasia. It would be political suicide to attack someone else right now. Japan would, of course, back the Republic of China to the hilt. But frankly the Republic is already doing great things for being just a few years old. I doubt they're really ready for a war themselves.
America: I still think you're overestimating the population of the west somewhat. It's nowhere near as populated as, say, Korea. Just for fun I looked up some census records. I estimate the occupied population of western America (not counting D.C. & New Orleans) as roughly 10,750,000 people (+ a few from lightly populated parts of CO & MT I suppose). 11 million is a lot, but not overwhelming. For comparison, the 1940 population of Japan, Korea, and Formosa is roughly as follows:
Japan proper (here including the Kurils and all of Sakhalin): 74 million
Korea: 23.5 million (this assumes a population reduction of roughly 500,000 as a result of the civil war)
Formosa: 5.5 million (with a population reduction of roughly 300,000 as a result of the civil war.
For the curious, I arrived at the population totals for western America from OTL census records, picking a number closer to the 1930 census for states that saw lots of fighting in the KR timeline & lots of immigration in the OTL, and a number closer to the 1940 census for the states not seeing a lot of fighting. The various states & provinces break down as follows:
California: 6 million (not much more than Formosa)
Washington: 1.6 million
Oregon: 1 million
British Columbia: 750,000
Utah: 530,000
Idaho: 470,000
Wyoming: 240,000
Nevada: 100,000
Alaska: 70,000
Sources:
http://www.census.gov/dmd/www/resapport/states/california.pdf
http://www.census.gov/dmd/www/resapport/states/utah.pdf
http://www.census.gov/dmd/www/resapport/states/nevada.pdf
http://www.census.gov/dmd/www/resapport/states/oregon.pdf
http://www.census.gov/dmd/www/resapport/states/washington.pdf
http://www.census.gov/dmd/www/resapport/states/wyoming.pdf
http://www.census.gov/dmd/www/resapport/states/idaho.pdf
http://www.census.gov/dmd/www/resapport/states/alaska.pdf
http://www12.statcan.gc.ca/census-r.../his/index-acc-eng.cfm?province=59&GEO=submit
http://en.wikipedia.org/wiki/Demographics_of_Imperial_Japan
Anyway, that's why I have 30+ divisions in America on anti-partisan duty. Sure, a lot of those are garrison divisions in the chief cities of the new puppet states. But a little over half are full infantry divisions with attached MP & Cavalry brigades (cavalry brigades have suppression, just like MP brigades). And those are deployed in the occupied areas. There's a division in or next to every occupied province on anti-partisan duty. When I get the time with my fleet I'll even move a garrison division onto Adak, the base in the Aleutians. Which, yes, makes Alaska very unprofitable. But them's the breaks. The rest of America is very profitable - no more resource problems at all!
P.S. Mexico, by comparison, is occupying roughly 7.5 million people: 6.5m Texans & .5m each for Arizona & NM, with a Mexico proper population of roughly 20 million. So yeah, kind of smart of them to not help me in the war. They're probably barely maintaining internal security as it is.