The conference, moreover, took place against the background of many new commemorative publications, including the Australian historian Prof. Christopher M. Clark’s account of World War I’s origins, titled “The Sleepwalkers.” An astounding global success, Professor Clark’s book has prompted a substantial revision among historians of the war’s causes. Whereas in the past German nationalism and bellicosity were singled out as disproportionately culpable, Mr. Clark lays equal blame on the other great powers, France, Russia, and Britain.