This is a biography of a borderland between Russia and Poland, a region where, in 1925, people identified as Poles, Germans, Jews, Ukrainians, and Russians lived side by side. Over the next three decades, this mosaic of cultures was modernized and homogenized out of existence by the ruling might of the Soviet Union, then Nazi Germany, and finally, Polish and Ukrainian nationalism. By the 1950s, this no place emerged as a Ukrainian heartland, and...