Another possibility, the Japanese seize the islands in 1940. Again, the logistics would be absolute beeping nightmare, but the British and French would have other problems at this point and there would be no guarantee of the Americans providing anything beyond moral support if Japan enters the war. The Japanese might follow Scott Palter’s idea and say “look, Winston, if you let us take the Dutch East Indies (to protect them from the Nazis, of course) we’ll join the war on your side and provide military support; if you refuse, you’ll have a world war on your hands at the worst possible moment.”
Most certainly another possibility!
Japan could certainly have more chances of acquiring a motive for such a move on the East Indies, and sensing an opportunity, after the fall of the Low Countries in May 1940 than at any earlier point, it just stands to reason. Also, while not under strict, mandatory US embargoes yet, it had been under greater US condemnation, the voluntary US "moral embargo" on aviation gasoline and aircraft, and the US had cancelled the trade treaty, giving it the *option* for wider sanctions, which had to alert Japan to the possibility of worse/more effective sanctions. Plus, the US had started to loan substantial money to China, and the China Incident had dragged on now over two years more than expected, in Japanese minds, in large part because of western and Soviet connivance.
Yes, leaving the Philippines and Guam at their back in 1940 is a sub-optimal pain in the butt. But there are wide shipping channels between Japan and the DEI that run through the Japanese controlled Mandated Islands. Also, the Philippines and Guam in 1940 are not mobilized at all for war, neither indigenous forces, nor the US garrison. The Pacific Fleet is still based out of San Diego, "exercising" in Hawaii in May and June, and only that summer the Navy Dept and Administration making the decision to keep it permanently based at Pearl. America is not showing signs of readiness *yet* to get involved in a war, despite getting a bit more meddlesome.
Leaving Borneo and Malaya-Singapore at the back of a Japanese expeditionary and occupation force for the DEI is even more of a pain in the butt and sub-optimal from a security of SLOCs point of view. But Britain in spring, summer, fall 1940 has way bigger, closer problems to worry about than the DEI. There would still be narrow shipping lanes through the South China Sea from Taiwan, Guangdong, and Hainan, down through the Spratlys, to the tiny Natunas, and into the inner seas between Sumatra, Java and Borneo/Kalimantan.
Who was Scott Palter, and where could I see his proposed idea about Japan "safeguarding the Indies from the Nazis"?
There are military considerations involved too, and military questions:
a) Japanese pilots, land-based and carrier-based, had to have more combat experience at dive-bombing and air-to-air combat by spring 1940 than they had in 1936 and 1937. This should make for more capable Japanese forces. The Japanese had more experienced ground combat forces and had conducted more opposed landings, most recently, Hainan in 1939.
b) The Japanese likely had more operational aircraft carriers and larger carrier air wings in spring 1940 than 1936, yes?
c) Had the Japanese improved any of the carrier or land-based aircraft models since 1936 or 1937 by spring 1940, in terms of range, or other performance parameters?
d) What had the Dutch KM and KNIL improved in the DEI Java and outer islands between 1936 and 1940?
e) What facility improvements had the Japanese made in the Mandated Islands, especially the Palaus and southern Carolines between 1936 and 1940 - any more airfields or ports helpful for ops in the DEI direction?
f) Did Japan now holding the island of Hainan now provide land-based aircraft an ability to range as far as Dutch Borneo/Kalimantan, or not yet?
g) If not, what about Northern Indochina/Tonkin, occupied in September 1940?
h) If not that, could Japan have gotten access to airfields in southern Indochina significantly earlier than the historic date of July 1941 for forward bases to support air operations ranging Borneo/Kalimantan and possibly Sumatra?
On one hand, this would still be a logistic headache for the Japanese; on the other, it would be much better than OTL.
Exactly. It is not that it would be logistically unfeasible, it would be that the Japanese would be leaving themselves
logistically exposed to counterattacks. But the kicker is they would be doing it at a time when potential adversaries were poorly placed to counterattack at all, much less counterattack with decisive near-term, medium-term effect and limited losses. It would not be an insane calculated risk. No more insane than what they actually did, assuming they could break up the fight with the USA and UK after a good first punch and stealing their purses.
I'm convinced that Japan lost a fantastic opportunity by not seizing the DEI in August-December 1940. The British were not going to intervene, the Americans were not going to intervene, and the Dutch were not going to be able to mount a sufficient defense.
Exactly. For reasons stated above.
It might mean that the trade-embargo would happened earlier, but with the DEI Japan is more able to withstand it.
Exactly. There's the idea that the US could build up the Philippines as a bee in Japan's bonnet, and declare "exclusion zones" that practically don't let Japan ship oil through, but the fact is, it would take the US years of build-up to be able to enforce any kind of blockade or meaningfully effect oil tanker traffic [other than by the important means of not having US origin tankers participate in it]. So, the US will be in a position for another two or three years from 1940 where yeah, it could corner Japan into yielding or going to war, but America would still lose the early battles of that war and force the Philippines to go through at least a brief occupation. The US War and Navy Departments, aware of their growing strength, and with Germany-first priorities, might judge it more prudent to not pour good money after bad in the surrounded Philippines and work toward defeat of Germany and building up the main Pacific fleet, by which point, who knows where diplomacy stands.
The population of the DEI was also much more palatable to the Japanese than the Vietnamese.
You're thinking more quiescent to Japanese occupiers? No Viet Minh guerrillas? To tell you the truth, the Viet Minh guerrillas were not super active or super problematic for the Japanese occupation in Indochina either, most of the time. and the Vichy didn't get in their way either. The Japanese used the facilities there and looted food and raw materials with little impediment. The Viet Minh mostly stayed underground in most parts of the country and had armed units in parts of the border region in the far north, and basically did a few raids on isolated units, puppet soldiers, and rice depots in the last months of the war. No big deal.
I have to assume the Japanese significantly misread how difficult it would be for FDR (or any US president) to persuade Congress (and the people) to act over an invasion of the DEI.
AFAICT, the Japanese considered the Dutch and Britons to be fully allied, and war against Britain would mean war against the US would be guaranteed at some point. In reality, the British government had given up any dreams of a defense of the DEI against the Japanese and categorically refused to guarentee its territorial integrity. Because of this the DEI government - which acted pretty independently from the Dutch government-in-exile- adopted a pretty much neutral stance towards Great Britain.
Regarding the two comments above. Yes, the Japanese, with regard to Southeast Asia in OTL, were both slow to recognize opportunities and potential methods of acting, and then when they decided they needed to take emergency action, jumped to conclusions about how wide the scope of that action had to be, ie it had to be Southeast Asia wide and Pacific-wide against all ABDA powers.
Both the Japanese and Germans seem to have had this attitude that "oh, the US joining the war is inevitable so it might as well be on our terms" which is certainly not how it was seen by the UK (or concerned Americans) who were trying to get the US to join the war.
Right.