Two grimly sobering anniversaries fall in November. On the 9th and 10th, we will mark the 80th anniversary of Kristallnacht—the orgy of murder and violence that devastated Jewish communities across Nazi Germany in 1938. The following day, Nov. 11, we will mark the centennial of the armistice that ended World War I—the most devastating military conflict the world had so far experienced.

These two events, occurring exactly 20 years apart, were intimately connected. Some historians argue that the 20th century really began with World War I, which buried the geriatric Habsburg and Ottoman Empires, and set the stage for the modern totalitarian systems of communism and fascism—directly paving the way for the rise in Germany of National Socialism and its unprecedented war on the Jews.

In all senses one can think of, there was a dramatic transformation in the position of Europe’s Jews between the end of the “Great War,” as it was dubbed, and the Nazi Holocaust that consumed nearly two-thirds of their number. For one thing, the record of Jewish military service in the war rather gruesomely demonstrated that Jews were also loyal, grateful citizens of the countries in which they lived. Given that French-Jewish army officer Alfred Dreyfus had been convicted of treason in an anti-Semitic show trial only two decades earlier, that record was even more striking.

More than 50,000 Jews fought on the British and Commonwealth side, 100,000 with the Germans and 300,000 with Austria-Hungary—many thousands of whom lost their lives in the process. From outside Europe, more than 200,000 Jews were among the approximately 5 million American service personnel in 1917, when the United States joined the Allied side.

When it came to Jewish civilians, the toll in the eastern half of Europe was particularly brutal, with hundreds of thousands of Jews deported to the Russian interior or murdered in bloody pogroms. Those ravages led several thousand Jews to join the ranks of the Bolshevik Revolution and even serve in its senior posts, but by the mid-1920s, the ruling Communist Party was no longer a polyglot underground organization. It was, in dramatic contrast, a ruling bureaucracy undergoing a profound process of “Russification.”

The experience of World War I left some Jewish communities feeling more integrated and secure, while others were exposed as highly vulnerable, or even decimated out of existence. It also made realistic the proposal of a national home for the Jewish people, an end-goal the British government regarded “with favor” in its Balfour Declaration of 1917. On Nov. 11, 1918, then, the world’s Jews could spy the promise of redemption on all the political paths—liberal-assimilationist, revolutionary, Zionist—that were available to them. Hardly any of them believed that mass extermination was awaiting them within a generation. To have even suggested such a thing to one of the 7,000 Jews decorated by Germany for their war service would probably have been insulting.

But as the polarizing settlement that ended World War I finally crumbled with Hitler’s launching of World War II, the old libels against the Jews—that they were tribally disloyal, that they profited from war both economically and in terms of political influence—returned with a vengeance. The British writer George Orwell noted the reluctance of his own government to combat such slanders. “To publicize the exploits of Jewish soldiers, or even to admit the existence of a considerable Jewish army in the Middle East, rouses hostility in South Africa, the Arab countries and elsewhere,” he wrote during World War II. “It is easier to ignore the whole subject and allow the man in the street to go on thinking that Jews are exceptionally clever at dodging military service.”

But the British were far from alone in falling for the myth that Jews are at their most disloyal in times, like wartime, when everyone else is at their most loyal. That trope was among the many anti-Semitic fabrications of the Nazis, whose dehumanizing propaganda campaigns and notorious racial laws discriminating against Jews exploded in the violence of Kristallnacht. More than 100 Jews were murdered on the streets of Germany during those hours of fire and broken glass, while 30,000 more were deported to camps whose names—Buchenwald, Sachsenhausen, Dachau—are now indelibly associated with the Holocaust.

These are the basic facts that the forthcoming commemorations of these two events will reflect. For Jews, these are occasions for profound historical reflection, in a year that has already witnessed the seventieth anniversary of the State of Israel’s creation. Both anniversaries are occasions to ponder how the crooked road of Jewish emancipation, whose benefits these days still far outweigh the persistence of anti-Semitism, felt for those who came before us.

Ben Cohen writes a weekly column for JNS on Jewish affairs and Middle Eastern politics. His writings have been published in Commentary, the New York Post, Haaretz, The Wall Street Journal and many other publications.