This book is remarkable for one of its conclusions: - In 1919, the old empires were dismantled (Germany, Austria-Hungary) and creates new countries to suit the nationalities (the right of peoples to self-emes m ^). - In 1945, was removed and even massacred in part, ethnic minorities, to match people with the borders of each country.
This book relates the facts (some of which are little known: the massacre of Poles by Ukrainian and vice versa) and puts them into an overall policy.
It is the logical continuation of "Blood Lands" Timothy Snyder.