As Soviet troops approached Auschwitz in January 1945, most of its population was sent west on a death march. The remaining prisoners were liberated on 27 January 1945, a day commemorated as International Holocaust Remembrance Day. In the following decades, survivors such as Primo Levi, Viktor Frankl, and Elie Wiesel wrote memoirs of their experiences in Auschwitz, and the camp became a dominant symbol of the Holocaust. In 1947 Poland founded the Auschwitz-Birkenau Memorial and Museum on the site of Auschwitz I and II, and in 1979 it was named a World Heritage Site by UNESCO.
When we think of the crimes of Nazi doctors, what comes to mind are their cruel and sometimes fatal experiments… Yet when we turn to the Nazi doctors’ role in Auschwitz, it was not the experiments that were most significant. Rather, it was his participation in the killing process—indeed his supervision of Auschwitz mass murder from beginning to end. 1

The process of losing any kind of hope was a very gradual one. We were transported in cattle wagons in which many babies and children suffocated, in what it turned out was the last transport of Hungarians. We had no water, no food, there was no hygiene. That diminished our hope and increased the feeling of being trapped. But despite that, you always retained a glimmer of hope. Always.
Next to physical labor, military drill played an important part, especially for the older men. Still to-day I can hear the command: 'Eyes right! Eyes front!' The drill consisted mainly of marching in large formations and in turns and practising the salute—a quick removal of the cap. Those who did not greet a passing S.S. man with this procedure laid themselves open to severe punishment. A sixty-five-year-old lawyer, who in spite of glasses could see very little, did not salute a passing 'superior officer,' and was struck so that his glasses were broken. His excuse that he was extremely nearsighted was answered with curses.
The Reichstag fire on 27 February 1933 gave Hitler a pretext for suppressing his political opponents. The following day he persuaded the Reich's President Paul von Hindenburg to issue the Reichstag Fire Decree, which suspended most civil liberties. The NSDAP won the parliamentary election on 5 March 1933 with 43.9 percent of votes, but failed to win an absolute majority. After the election, hundreds of thousands of new members joined the party for opportunistic reasons, most of them civil servants and white-collar workers. They were nicknamed the "casualties of March" (German: Märzgefallenen) or "March violets" (German: Märzveilchen).[78] To protect the party from too many non-ideological turncoats who were viewed by the so-called "old fighters" (alte Kämpfer) with some mistrust,[79] the party issued a freeze on admissions that remained in force from May 1933 to 1937.[80]
None of the categories are independent - one could classify many camps as a mixture of several of the above. All camps had some of the elements of an extermination camp, but systematic extermination of new arrivals by gas chambers only occurred in specialized camps. These were extermination camps, where all new-arrivals were simply killed—the "Aktion Reinhard" camps (Treblinka, Sobibór and Belzec), together with Chelmno. Two others ( Auschwitz and Majdanek) operated as combined concentration- and extermination-camps. Others like Maly Trostenets were at times classified[by whom?] as "minor extermination camps".[50]
The metaphor of war encouraged the inhumanity of the S.S. officers, which they called toughness; licensed physical violence against prisoners; and accounted for the military discipline that made everyday life in the K.L. unbearable. Particularly hated was the roll call, or Appell, which forced inmates to wake before dawn and stand outside, in all weather, to be counted and recounted. The process could go on for hours, Wachsmann writes, during which the S.S. guards were constantly on the move, punishing “infractions such as poor posture and dirty shoes.”
Auschwitz-Birkenau, the largest of the concentration and extermination camps established on Polish soil, served concurrently as a labor camp and as a center for the rapid extermination of Jews. Chosen as the central location for the annihilation of the Jewish people, it was equipped with several extermination facilities and crematoria. Extermination was carried out by means of Zyklon B gas, a substance that had previously been tested on Russian prisoners of war.
When the Italian invasion of Ethiopia led to only mild protests by the British and French governments, on 7 March 1936 Hitler used the Franco-Soviet Treaty of Mutual Assistance as a pretext to order the army to march 3,000 troops into the demilitarised zone in the Rhineland in violation of the Versailles Treaty.[60] As the territory was part of Germany, the British and French governments did not feel that attempting to enforce the treaty was worth the risk of war.[61] In the one-party election held on 29 March, the NSDAP received 98.9 percent support.[61] In 1936, Hitler signed an Anti-Comintern Pact with Japan and a non-aggression agreement with Mussolini, who was soon referring to a "Rome-Berlin Axis".[62]

In November 1938 a young Jewish man requested an interview with the German ambassador in Paris and met with a legation secretary, whom he shot and killed to protest his family's treatment in Germany. This incident provided the pretext for a pogrom the NSDAP incited against the Jews on 9 November 1938. Members of the SA damaged or destroyed synagogues and Jewish property throughout Germany. At least 91 German Jews were killed during this pogrom, later called Kristallnacht, the Night of Broken Glass.[306][307] Further restrictions were imposed on Jews in the coming months – they were forbidden to own businesses or work in retail shops, drive cars, go to the cinema, visit the library, or own weapons, and Jewish pupils were removed from schools. The Jewish community was fined one billion marks to pay for the damage caused by Kristallnacht and told that any insurance settlements would be confiscated.[308] By 1939, around 250,000 of Germany's 437,000 Jews had emigrated to the United States, Argentina, Great Britain, Palestine, and other countries.[309][310] Many chose to stay in continental Europe. Emigrants to Palestine were allowed to transfer property there under the terms of the Haavara Agreement, but those moving to other countries had to leave virtually all their property behind, and it was seized by the government.[310]
Beginning a pattern that became typical after the war began, economic considerations had an increasing impact on the selection of sites for concentration camps after 1937. For instance, Mauthausen and Flossenbürg were located near large stone quarries. Likewise, concentration camp authorities increasingly diverted prisoners from meaningless, backbreaking labor to still backbreaking and dangerous labor in extractive industries, such as stone quarries and coal mines, and construction labor.
Germany's wartime foreign policy involved the creation of allied governments controlled directly or indirectly from Berlin. They intended to obtain soldiers from allies such as Italy and Hungary and workers and food supplies from allies such as Vichy France.[79] Hungary was the fourth nation to join the Axis, signing the Tripartite Pact on 27 September 1940. Bulgaria signed the pact on 17 November. German efforts to secure oil included negotiating a supply from their new ally, Romania, who signed the Pact on 23 November, alongside the Slovak Republic.[80][81][82] By late 1942, there were 24 divisions from Romania on the Eastern Front, 10 from Italy, and 10 from Hungary.[83] Germany assumed full control in France in 1942, Italy in 1943, and Hungary in 1944. Although Japan was a powerful ally, the relationship was distant, with little co-ordination or co-operation. For example, Germany refused to share their formula for synthetic oil from coal until late in the war.[84]
At the end of the war, Europe had more than 40 million refugees,[156] its economy had collapsed, and 70 percent of its industrial infrastructure was destroyed.[157] Between twelve and fourteen million ethnic Germans fled or were expelled from central, eastern, and southeastern Europe to Germany.[158] The West German government estimated a death toll of 2.2 million civilians due to the flight and expulsion of Germans and through forced labour in the Soviet Union.[159] This figure remained unchallenged until the 1990s, when some historians put the death toll at 500,000–600,000 confirmed deaths.[160][161][162] In 2006, the German government reaffirmed its position that 2.0–2.5 million deaths occurred.[f]
On the morning of 4 August 1944, the Achterhuis was stormed by a group of German uniformed police (Grüne Polizei) led by SS-Oberscharführer Karl Silberbauer of the Sicherheitsdienst.[37] The Franks, van Pelses, and Pfeffer were taken to RSHA headquarters, where they were interrogated and held overnight. On 5 August they were transferred to the Huis van Bewaring (House of Detention), an overcrowded prison on the Weteringschans. Two days later they were transported to the Westerbork transit camp, through which by that time more than 100,000 Jews, mostly Dutch and German, had passed. Having been arrested in hiding, they were considered criminals and sent to the Punishment Barracks for hard labour.[38]
By 1940, the CCI came under the control of the Verwaltung und Wirtschaftshauptamt Hauptamt (VuWHA; Administration and Business office) which was set up under Oswald Pohl.[25] Then in 1942, the CCI became Amt D (Office D) of the consolidated main office known as the SS-Wirtschafts-Verwaltungshauptamt (SS Economic and Administrative Department; WVHA) under Pohl.[25] In 1942, the SS built a network of extermination camps to systematically kill millions of prisoners by gassing. The extermination camps (Vernichtungslager) and death camps (Todeslager) were camps whose primary function was genocide. The Nazis themselves distinguished the concentration camps from the extermination camps.[26][27] The British intelligence service had information about the concentration camps, and in 1942 Jan Karski delivered a thorough eyewitness account to the government.