Had Churchill and Stalin scrutinized a map at Tehran when they first proposed shifting Poland westward toward the Oder (and checked off their acceptance as they had with the “naughty” memo in October 1944, when they divided the Balkans into spheres of influence), they might have avoided the current predicament. And had Roosevelt displayed resolve at Yalta rather than, as described by Eden, “playing it by ear,” a more concise accord might have been reached. And, had Harry Hopkins been on hand in his role as presidential fixer, he might have guided Truman to more resolve.
The authors do a lot of this counterfactual speculation, saying that history would have come out better if people had acted differently than they in fact did. I'm not onboard with it.

