I'm not going to review the book here, as I've been requested to review it elsewhere; should it ever get posted there, I'll link to it.
A comment, however, demonstrated by an interesting anecdote. The 1940's were the modern heyday of what we now call ethnic cleansing, a term invented in the 1990s for the events in the disintegrating Yugoslavia, perhaps by journalists who weren't aware of how common the phenomenon had been and thought they were seeing something new. Between the 1930s and the 1950s the practice was implemented on many millions of people, perhaps even tens of millions, in various parts of the world. Mazower, however, tells of a case I admit I hadn't been aware of in more than a general way:
By April 1943, UPA (the Ukrainian Insurgent Army) had 10-20,000 members, and, prompted by news of Stalingrad, they embarked on a campaign of ethnic cleansing to make room for a future Ukrainian state before the Russians arrived. First they attacked Himmler's ethnic German settlements and burned many of them down. Next they turned on the Poles, killing an estimated 50,000; many more fled westwards. Thanks to well-planned massacres and expulsions they had virtually succeeded by December in bringing Vohlynia under Ukrainian control, helped by thousands of peasants who coveted land controlled by Poles. "Liquidate all Polish traces", ran an OUN order from early 1944. "Destroy all walls in the Catholic church and other Polish prayer houses. Destroy orchards and trees in the courtyards so that there will be no trace that someone lived there... Pay attention to the fact that when something remains that is Polish, then the Poles will have pretensions to our land". (p.507)The astonishing part of this story is that it happened while the Germans still controlled the area. The numbers of the murdered Polish civilians are also high, though the numbers of them forced to leave, eventually reaching hundreds of thousands in that area alone, were not particularly unusual for those times. Of course, the Ukrainians succeeded: there are essentially no Poles left in what is now Western Ukraine, nor anyone except the descendants and a handful of scholars who still remember that the area had been settled by Poles and sometimes controlled by them for centuries - and hadn't been controlled by the Ukrainians, ever.
Thus, when the Palestinians set out to ethnically cleanse the Jews in 1947, it was in a context where such actions were so common, that the murder of 50,000 Poles and the expulsion of hundreds of thousands of them wasn't even noticed.