What's the premise of that book?
I have the book also... the premise is that Chiang doesn't go on the offensive into Manchuria.... by not taking on the Communists in ther "home turf" he keeps a nationalist China on the mainland, with Manchuria ending up a Soviet dominated Chinese communist state, basically East Germany in East Asia.
That's the premise of the essay. The book itself is a collection of various essays and such. Some, like the China one, seem reasonable and believable. Others are not so much, even by the standards of amateur alternate history. Such as "Napoleon's Invasion of North America", where the only real reason that the US doesn't fall to Napoleon is because of the mosquito. Or "Prime Minister Halifax", where a Britain that folds (and becomes pro-Nazi policy-wise) and a non-involved US leads to not only the Soviets owning all of Europe by 1946 despite a more successful Barborosa, but leapfrogging the US and soon to become the sole nuclear superpower.
Probably the stupidest one is David Fromkin's "Triumph of the Dictators". Apparently, according to Fromkin, Hitler and Stalin were poised to be BFFs, Japan was "ready to... invade India" and ignore the US and its embargo by seizing the Indies, from which Japan would ship tons of oil to Germany. Then Hitler should send the bulk of his armies under Rommel (who took the entire Middle East with a single division) to invade India, from which a land link would be made between Germany and Japan, after which Europe, Asia, and Africa would belong to the unbeatable Nazi-Soviet-Japanese alliance.
So unbeatable and resource superior to the US, as a matter of fact, that, and I'm quoting straight from the passage, "the English-speaking countries would have been isolated in a hostile world and would have had no realistic option but to make their peace with the enemy, retaining some autonomy for a time, perhaps, but doomed to ultimately succumb. Nazi Germany, as the leader of the coalition, would have ruled the world." And only thanks to the entirely unexpected and unreasonable Nazi invasion was the world saved from eternally being under a perfectly coordinated totalitarian rule.
Just the number of inaccuracies, ignorances, and oversimplification present in these four paragraphs and a sentence hurts. I was hoping better from an actual scholar.