The seeds of modern anti-Semitism were already present by 1920. Jews had often been scapegoated for societal problems in Europe, and they were frequently accused of economic manipulation, political subversion, or religious betrayal. The end of World War I and the economic and political instability that followed gave new life to these old prejudices. Many Germans, in particular, were bitter over the Treaty of Versailles, which imposed harsh penalties on Germany. Into this discontent stepped Adolf Hitler and the Nazi Party, who blamed Germany’s defeat and subsequent suffering on Jews, Marxists, and other so-called “enemies within.”
Hitler's virulent anti-Semitism was central to Nazi ideology from its earliest days. In Mein Kampf, written in the 1920s, Hitler laid out a worldview in which Jews were portrayed as a racial threat, responsible for communism, capitalism, and the decay of German society. This racial anti-Semitism went beyond religious prejudice; Jews were described not just as a religious group but as biologically inferior and dangerous, incapable of assimilation. Hitler’s rise to power in 1933 marked the beginning of state-sponsored anti-Semitism on a scale never before seen.
Once in power, the Nazis moved quickly to marginalise Jews from German public life. The 1935 Nuremberg Laws stripped Jews of their German citizenship and prohibited marriage or sexual relations between Jews and Aryans. Jews were excluded from public sector jobs, education, the military, and the arts. Jewish-owned businesses were boycotted or forcibly sold at below-market prices to non-Jewish Germans—a process known as “Aryanisation.” This legal and economic persecution isolated Jews socially and financially, and it encouraged the broader population to accept anti-Jewish policies as normal and patriotic.
The situation worsened in the late 1930s. The events of Kristallnacht in November 1938—a state-sponsored pogrom in which synagogues were burned, Jewish businesses destroyed, and thousands of Jews arrested—marked a turning point. It made clear that violent persecution was now official policy. After Kristallnacht, many Jews sought to flee Germany, but emigration was increasingly difficult. Countries like Britain, the United States, and others imposed strict immigration quotas, and many Jews were trapped in Nazi-controlled Europe as the continent hurtled toward war.
With the invasion of Poland in 1939 and the outbreak of World War II, anti-Semitic policies extended into the occupied territories. In Poland, which had the largest Jewish population in Europe, Jews were confined to ghettos—overcrowded, walled-off urban areas with deplorable living conditions. They were forced to wear identifying yellow stars, and their property was confiscated. Disease and starvation were rampant in the ghettos. Similar ghettos were established across Eastern Europe. The goal was to isolate and dehumanise Jews while planning for more radical solutions.
The most horrifying aspect of this period came with the Nazi decision to implement the “Final Solution” to the so-called “Jewish Question.” This term referred to the planned, systematic extermination of the Jewish population in Europe. At the Wannsee Conference in January 1942, senior Nazi officials formalised the genocidal plan. Extermination camps—such as Auschwitz-Birkenau, Treblinka, Sobibor, and Belzec—were constructed or repurposed for mass murder. Unlike concentration camps, which used forced labour and repression, extermination camps were designed purely to kill. Victims were transported in cattle cars and often murdered within hours of arrival, usually in gas chambers.
By the end of the war in 1945, approximately six million Jews—two-thirds of Europe's pre-war Jewish population—had been murdered. This included 1.5 million children. The Holocaust also claimed millions of other victims, including Romani people, Soviet POWs, disabled individuals, and political opponents. But Jews were uniquely targeted for total annihilation.
The impact on Europe was profound. Entire communities that had existed for centuries were wiped out. In places like Poland, Ukraine, Lithuania, and Hungary, thriving Jewish cultures vanished almost overnight. Yiddish, the traditional language of many Eastern European Jews, became endangered. The Holocaust erased not only people but also an entire way of life. Synagogues, schools, libraries, and businesses were destroyed or left abandoned. Even in places that were not directly under Nazi occupation, such as Vichy France or Fascist Italy, anti-Semitic policies were enacted under pressure from or in imitation of Germany.
Anti-Semitism was not confined to Germany. Across occupied Europe, local collaborators played an active role in identifying, rounding up, and deporting Jews. In countries like Romania, Hungary, and Slovakia, governments aligned with Nazi policies and participated in deportations. In France, the Vichy regime organised its own round-ups, such as the notorious Vel’ d’Hiv raid in 1942, where thousands of Jews were detained and sent to Auschwitz. In many instances, ordinary citizens were complicit—whether through direct collaboration, indifference, or fear.
The psychological and moral effects of the Holocaust were immense. The revelation of the death camps at the end of the war shocked the world. The Nuremberg Trials (1945–1946) were held to bring leading Nazis to justice and to establish the legal concept of crimes against humanity. Holocaust survivors faced further hardship after the war, many finding their homes destroyed or occupied by others. Some faced continued anti-Semitism, even in countries liberated from Nazi rule. The trauma endured by survivors would shape post-war Jewish identity and contribute to a global push for the creation of a Jewish homeland, resulting in the foundation of Israel in 1948.
In response to the Holocaust, Europe also began to confront its history of anti-Semitism, though this process was slow and uneven. Laws were passed to outlaw hate speech, and Holocaust education became part of many school curricula. Memorials and museums were erected to commemorate the victims. Yet even decades later, debates continue about the responsibility of various governments, institutions, and individuals during the Nazi era.
In conclusion, the period from 1920 to 1945 saw anti-Semitism evolve into a genocidal force that culminated in the Holocaust, the most horrific crime of the modern age. The effects on Europe were vast: the decimation of Jewish life and culture, the exposure of deep-seated prejudice, the moral reckoning that followed, and the reshaping of international law and post-war politics. The Holocaust remains a central warning of where hatred, indifference, and authoritarianism can lead. Europe was not only altered demographically but also forced to confront the darkest capacities of its own civilisation.