You can debate whether the events Kaos outlined leading up to 2027 are sound from a foreign policy standpoint (though I really haven't seen anyone give a well written, logically grounded blow-by-blow about why each individual milestone is impossibly far fetched)
Milestone 1: North Korea merges with South Korea. No, just no.
Milestone 2: Korea assimilates Japan. What?
Milestone 3: Korea invades the US. And they have an EMP. And no other countries intervene. And they have the manpower to do this. And the firepower. Ok. This is not far fetched.
Heh, I didn't think anyone would take me up so quick, but this still isn't quite what I had in mind.
The following is only a brief examination, mind, not column length or anything. Don't expect and brilliantly defended points or counterpoints
Milestone 1: "No, just no" isn't a proper argument, but I actually agree. I do see it as very unlikely, and this is probably the most contentious part of the backstory. The recent incident with the artillery attack on South Korea, likely related to Kim Jong-Un's inevitable and ever nearer succession, isn't a big indicator that he'll be any more open to unification than Kim Jong-Il, even if it is part of a long term strategy to establish Korea as a major world power. Still, we don't know hardly anything for certain yet. The biggest issue that makes this unlikely is social inertia. North Korea has used hatred of the outside world as a unifying force for so long, that not even two and a half years is a long enough time to change the public attitude towards reunification, no matter how it was spun. That's not even mentioning South Korea, which has a considerable number of hawkish political figures that would never condone reunification, and reflect a similar general attitude. So milestone one is unlikely in two and a half years. Ten years, maybe, but not two and a half. Yet, it wasn't too long ago that South and North Korea were almost
on the verge of reconciliation. Maybe it was something to do with the announcement of Starcraft 2. Only time will tell.
Milestone 2: This is more plausible given the intervening events, which are follows:
2015: The effects of peak oil are felt as gas prices reach up to 20 dollars a gallon due to a war between Iran and Saudi Arabia. Russia cuts off all oil trade with Europe. Survivalist literature become bestsellers in America. China's influences diminish.
2016: America withdraws its military from Japan and other countries overseas, focusing on its instability back home. Texas splits from the United States, border bloodshed takes place as refugees from other states attempt to enter Texas.
2017: Martial law is declared in the United States as its infrastructure crumbles due to financial deficiencies.
None of these are far fetched. There are already significant political forces in Japan that want American garrisons out, and with Korea seemingly a diminished threat, and America undergoing its own significant domestic problems, the decision seems plausible. Texas succeeding is kind of unlikely, but not unimaginable given the circumstances. I imagine that Mexico's horrific and very literal drug wars will have spilled over into Texas by then (in this alternate universe at least), combining with other world events to create a much more survivalist - and therefore independent - attitude. In a post peak-oil world, the financial woes of the United States are mostly credible, if handled poorly enough, so by 2018, I can pretty easily see America as unable to help Japan. Of course, Japan has a very powerful arm...err...self defense force, but given Japan has almost no access to domestic oil and is powered to no small extent by international trade, I can see them suffering even worse in the post-peak oil world as America.
Milestone 3: Lol, not far fetched at all. But seriously, a nuclear device built solely for generating an EM pulse wouldn't be too far fetched by 2027. Most modern American military hardware is EMP hardened, but I'm imagining that a lot of the military hardware we're currently using has aged, and in the economic and domestic crises, was replaced by less secure, unhardened hardware. Still, I don't imagine an EMP attack being nearly as effective as is depicted in Homefront either. No other countries intervene because no other countries can
intervene, or have an interest in intervening. Keep in mind that America itself didn't intervene in the Second World War until we were actually attacked, and our depression era economy wasn't nearly
as bad as the economic condition of any other powers that could conceivably spare the resources to help in the Homefront timeline. Also keep in mind that from what I've read, the Koreans don't
have the manpower to fully control the United States, they have to pick and choose very carefully what resources and targets they take. After all, I imagine (I haven't played the game) that Homefront tells the story about how the Koreans failed
to invade America. That's something a lot of people around here tend to forget, that the Koreans didn't succeed, that even though they got as far as controlling several major urban centers, they were eventually pushed back.
So, is is likely? No. Plausible? Maybe. Within range of suspension of disbelief? For me, anyway. I understand that it may vary.