What Ifs? of American History was actually the best, by which I mean about a quarter of the essays printed were engaging and dealt with the actual changes and consequences that the title advertised with maybe about another two that posed good questions and setup interesting changes but did nothing with them.
For an example of the sort of disconnect between what they were and what they should have been the essay "China Without Tears" in the original collection included a good map of a China divided between a Communist Manchuria, RoC, a still independent Tibet and a Xinjiang SSR. Now, the problem is that nowhere in the text is what happened to Xinjiang ever discussed or even mentioned.