A flagbearer for the increasingly fashionable genre of "transnational history," Timothy Snyder's Bloodlands is, first and foremost, a stunning example of the critical thinking skill of evaluation. Snyder's linguistic precocity allows him to cite evidence in 10 languages, putting fresh twists on the familiar story of World War II fighting on the Eastern Front from 1941-45. In doing so, he works to humanize the estimated 14 million people who lost...