In 1940, the Nazis used carbon monoxide gas in secret euthanasia programs at mental hospitals in Germany to eliminate mentally ill or disabled people. From there, it was but a small step to Zyklon B, a cyanide compound designed for delousing. In September 1941, Auschwitz guards herded hundreds of Soviet POWs and sick inmates into the crudely sealed basement of Block 11, the dreaded punishment barrack; a guard threw in pellets of Zyklon B and shut the doors. They were the first people gassed at Auschwitz.
The first camp in Germany, Dachau, was founded in March 1933.[13] The press announcement said that "the first concentration camp is to be opened in Dachau with an accommodation for 5,000 people. All Communists and – where necessary – Reichsbanner and Social Democratic functionaries who endanger state security are to be concentrated there, as in the long run it is not possible to keep individual functionaries in the state prisons without overburdening these prisons."[13] Dachau was the first regular concentration camp established by the German coalition government of National Socialist Workers' Party (Nazi Party) and the Nationalist People's Party (dissolved on 6 July 1933). Heinrich Himmler, then Chief of Police of Munich, officially described the camp as "the first concentration camp for political prisoners."[13]
On August 4, 1944, the Gestapo (German Secret State Police) discovered the hiding place. It has been long thought that the authorities acted after being tipped off by an anonymous Dutch caller. But a more recent theory is that the German SD discovered the hiding place by chance, while investigating reports that illegal work and fraud with ration coupons were occurring at the house.
Historians regard the equation of National Socialism as 'Hitlerism' as too simplistic since the term was used prior to the rise of Hitler and the Nazis and the different ideologies incorporated into Nazism were already well established in certain parts of German society before World War I.[27] The Nazis were strongly influenced by the post–World War I far-right in Germany, which held common beliefs such as anti-Marxism, anti-liberalism and antisemitism, along with nationalism, contempt for the Treaty of Versailles and condemnation of the Weimar Republic for signing the armistice in November 1918 which later led it to sign the Treaty of Versailles.[28] A major inspiration for the Nazis were the far-right nationalist Freikorps, paramilitary organizations that engaged in political violence after World War I.[28] Initially, the post–World War I German far-right was dominated by monarchists, but the younger generation, which was associated with Völkisch nationalism, was more radical and it did not express any emphasis on the restoration of the German monarchy.[29] This younger generation desired to dismantle the Weimar Republic and create a new radical and strong state based upon a martial ruling ethic that could revive the "Spirit of 1914" which was associated with German national unity (Volksgemeinschaft).[29]
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.
More than 40 sub-camps, exploiting the prisoners as slave laborers, were also founded, mainly as various sorts of German industrial plants and farms, between 1942 and 1944. The largest of them was called Buna (Monowitz, with ten thousand prisoners) and was opened by the camp administration in 1942 on the grounds of the Buna-Werke synthetic rubber and fuel plant, six kilometers from the Auschwitz camp. The factory was built during the war by the German IG Farbenindustrie cartel, and the SS supplied prisoner labor. On November 1943, the Buna sub-camp became the seat of the commandant of the third part of the camp, Auschwitz III, to which some other Auschwitz sub-camps were subordinated.
In 1991, Holocaust deniers Robert Faurisson and Siegfried Verbeke produced a booklet titled "The Diary of Anne Frank: A Critical Approach", in which they revived the allegation that Otto Frank wrote the diary. Purported evidence, as before, included several contradictions in the diary, that the prose style and handwriting were not those of a teenager, and that hiding in the Achterhuis would have been impossible.[99][100] In 1993, the Anne Frank House in Amsterdam and the Anne Frank Fonds in Basel filed a civil lawsuit to prohibit further distribution of Faurisson and Verbeke's booklet in the Netherlands. In 1998, the Amsterdam District Court ruled in favour of the claimants, forbade any further denial of the authenticity of the diary and unsolicited distribution of publications to that effect, and imposed a penalty of 25,000 guilders per infringement.[101]
From 1942 onwards, Auschwitz became one of the greatest scenes of mass murder in recorded history. The vast majority of the camp's 1.1 million Jewish men, women, and children, deported from their homes across occupied Europe to Auschwitz, were sent immediately to their deaths in the Birkenau gas chambers upon arrival, usually transported into the camp by overcrowded cattle wagons. Their bodies were afterwards cremated in industrial furnaces in the crematoria. Those who were not killed in the gas chambers often died of disease, starvation, medical experiments, forced labor, or execution.
In May 1940, Germany invaded the Netherlands, and the occupation government began to persecute Jews by the implementation of restrictive and discriminatory laws; mandatory registration and segregation soon followed.[13] Otto Frank tried to arrange for the family to emigrate to the United States – the only destination that seemed to him to be viable[14] – but Frank's application for a visa was never processed, due to circumstances such as the closing of the U.S. consulate in Rotterdam and the loss of all the paperwork there, including the visa application.[15] Even if it had been processed, the U.S. government at the time was concerned that people with close relatives still in Germany could be blackmailed into becoming Nazi spies.[14]

The Auschwitz I main camp was a place of extermination, effected mainly by depriving people of elementary living conditions. It was also a centre for immediate extermination. Here were located the offices of the camp’s administration, the local garrison commander and the commandant of Auschwitz I, the seat of the central offices of the political department, and the prisoner labour department. Here too were the main supply stores, workshops and Schutzstaffel (SS) companies. Work in these administrative and economic units and companies was the main form of forced labour for the inmates in this camp.

The first gas chamber at Birkenau was in what prisoners called the "little red house" (known as bunker 1 by the SS), a brick cottage that had been converted into a gassing facility. The windows were bricked up and its four rooms converted into two insulated rooms, the doors of which said "Zur Desinfektion" ("to disinfection"). It was operational by March 1942. A second brick cottage, the "little white house" or bunker 2, was converted and operational by June 1942.[45] When Himmler visited the camp on 17 and 18 July 1942, he was given a demonstration of a selection of Dutch Jews, a mass killing in a gas chamber in bunker 2, and a tour of the building site of the new IG Farben plant being constructed at the nearby town of Monowitz.[46]
Most Germans were relieved that the conflicts and street fighting of the Weimar era had ended. They were deluged with propaganda orchestrated by Minister of Public Enlightenment and Propaganda Joseph Goebbels, who promised peace and plenty for all in a united, Marxist-free country without the constraints of the Versailles Treaty.[44] The NSDAP obtained and legitimised power through its initial revolutionary activities, then through manipulation of legal mechanisms, the use of police powers, and by taking control of the state and federal institutions.[45][46] The first major Nazi concentration camp, initially for political prisoners, was opened at Dachau in 1933.[47] Hundreds of camps of varying size and function were created by the end of the war.[48]
The lead editors of the Encyclopedia of Camps and Ghettos, 1933–1945 of the United States Holocaust Memorial Museum, Geoffrey Megargee and Martin Dean, cataloged some 42,500 Nazi ghettos and camps throughout Europe, spanning German-controlled areas from France to Russia and Germany itself, operating from 1933 to 1945. They estimate that 15 million to 20 million people died or were imprisoned in the sites.[36]

That is why, since its creation in 2009, the foundation that raises money to maintain the site of Auschwitz-Birkenau has had a guiding philosophy: “To preserve authenticity.” The idea is to keep the place intact, exactly as it was when the Nazis retreated before the Soviet Army arrived in January 1945 to liberate the camp, an event that resonates on Holocaust Remembrance Day, on Thursday.

After the war, the Allies occupied Germany, outlawed the Nazi Party and worked to purge its influence from every aspect of German life. The party’s swastika flag quickly became a symbol of evil in modern postwar culture. Although Hitler killed himself before he could be brought to justice, a number of Nazi officials were convicted of war crimes in the Nuremberg trials, which took place in Nuremberg, Germany, from 1945 to 1949.
In January 1934, Germany signed a non-aggression pact with Poland.[73] In March 1939, Hitler demanded the return of the Free City of Danzig and the Polish Corridor, a strip of land that separated East Prussia from the rest of Germany. The British announced they would come to the aid of Poland if it was attacked. Hitler, believing the British would not actually take action, ordered an invasion plan should be readied for September 1939.[74] On 23 May, Hitler described to his generals his overall plan of not only seizing the Polish Corridor but greatly expanding German territory eastward at the expense of Poland. He expected this time they would be met by force.[75]
Arthur Moeller van den Bruck was initially the dominant figure of the Conservative Revolutionaries influenced Nazism.[118] He rejected reactionary conservatism while proposing a new state that he coined the "Third Reich", which would unite all classes under authoritarian rule.[119] Van den Bruck advocated a combination of the nationalism of the right and the socialism of the left.[120]
Similar to the Trump administration’s apparent hope that the breakup of families would deter unwanted migration, the British sought to deter Boer fighters. British parliamentarians critical of the policy labelled these “concentration camps,” alluding to the Spanish policy of the “reconcentration” of civilians during the Spanish-American War (1898).
By the end of the war, the number of people who had died in the concentration camps, from all causes—starvation, sickness, exhaustion, beating, shooting, gassing—was more than eight hundred thousand. The figure does not include the hundreds of thousands of Jews gassed on arrival at Auschwitz. If the K.L. were indeed a battlefront, as the Death’s-Head S.S. liked to believe, the deaths, in the course of twelve years, roughly equalled the casualties sustained by the Axis during the Battle of Stalingrad, among the deadliest actual engagements of the war. But in the camps the Nazis fought against helpless enemies. Considered as prisons, too, the K.L. were paradoxical: it was impossible to correct or rehabilitate people whose very nature, according to Nazi propaganda, was criminal or sick. And as economic institutions they were utterly counterproductive, wasting huge numbers of lives even as the need for workers in Germany became more and more acute.
A column of inmates reached the Gross-Rosen complex. Throughout February, the terribly overcrowded main camp at Gross-Rosen was cleared, and all 44,000 inmates were moved further west. An unknown number died in this last journey.[245] In March 1945, Himmler ordered that no more prisoners should be killed, as he hoped to use them as hostages in negotiations with the Allies.[246] Approximately 20,000 Auschwitz prisoners made it to Bergen-Belsen, where they were liberated by the British in April 1945.[247]
This debacle did not discourage Himmler and Pohl. On the contrary, with the coming of war, in 1939, S.S. ambitions for the camps grew rapidly, along with their prisoner population. On the eve of the war, the entire K.L. system contained only about twenty-one thousand prisoners; three years later, the number had grown to a hundred and ten thousand, and by January, 1945, it was more than seven hundred thousand. New camps were built to accommodate the influx of prisoners from conquered countries and then the tens of thousands of Red Army soldiers taken prisoner in the first months after Operation Barbarossa, the German invasion of the U.S.S.R.
Under Nazism, with its emphasis on the nation, individualism was denounced and instead importance was placed upon Germans belonging to the German Volk and "people's community" (Volksgemeinschaft).[272] Hitler declared that "every activity and every need of every individual will be regulated by the collectivity represented by the party" and that "there are no longer any free realms in which the individual belongs to himself".[273] Himmler justified the establishment of a repressive police state, in which the security forces could exercise power arbitrarily, by claiming that national security and order should take precedence over the needs of the individual.[274]
That month, Himmler ordered the evacuation of all camps, charging camp commanders with "making sure that not a single prisoner from the concentration camps falls alive into the hands of the enemy".[240] Beginning on 17 January, 56,000–58,000 Auschwitz detainees—over 20,000 from Auschwitz I and II, over 30,000 from subcamps, and two-thirds of them Jews—were evacuated under guard, largely on foot, in severe winter conditions, heading west.[241][242] Around 2,200 were evacuated by rail from two subcamps; fewer than 9,000 were left behind, deemed too sick to move.[243] During the marches, camp staff shot anyone too sick or exhausted to continue, or anyone stopping to urinate or tie a shoelace. SS officers walked behind the marchers killing anyone lagging behind who had not already been shot.[235] Peter Longerich estimates that a quarter of the detainees were thus killed.[236] Those who managed to walk to Wodzisław Śląski and Gliwice were sent on open freight cars, without food, to concentration camps in Germany: Bergen-Belsen, Buchenwald, Dachau, Flossenburg, Gross-Rosen, Mauthausen, Dora-Mittelbau, Ravensbruck, and Sachsenhausen.[244]

What is troubling about Hitler’s American Model—though Whitman never mentions it—is how closely the events of the 1930s mirror our own. Such statements are bound to seem exaggerated. But even by the early 1930s, Germany was not destined to arrive at catastrophe. The ideas in the air at the time, including anti-Semitism specifically, are still the object of white nationalist fantasy today. What is most alarming is an unstated implication of Whitman’s thesis: if U.S. racism, anti-immigrant hostility, and third-class citizenship influenced the Nazi regime, then remnants of such influence must still exist today. Indeed, they appear to be resurgent.
The Auschwitz Jewish Center (AJC) in Oświęcim, operated by the Museum of Jewish Heritage — A Living Memorial to the Holocaust, is just two miles from the Auschwitz–Birkenau death camps. The only Jewish presence in the vicinity of Auschwitz, the Center opened its doors in September 2000 so that people from around the world could gather to learn, pray, and remember the victims of the Holocaust.
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]
Known as block 13 until 1941, block 11 of Auschwitz I was the prison within the prison, where violators of the numerous rules were punished. To extract information from them, guards would hold inmates' heads held against the stove, burning their faces and eyes. Some prisoners were made to spend the nights in standing cells. Measuring 1.5 m2 (16 sq ft), the cells held four men who could do nothing but stand, and who were forced the following day to work as usual.[137] In other cells, inmates were subjected to hanging with their hands behind their backs, thus dislocating their shoulder joints. In the basement were the "dark cells", which had only a 5 x 5 cm opening and a solid door. Prisoners placed in these cells gradually suffocated as they ran out of oxygen; sometimes the SS lit a candle in the cell to use up the oxygen more quickly.[138]
There is no more forceful advocate for the preservation of Auschwitz than Wladyslaw Bartoszewski. Born in Warsaw in 1922, Bartoszewski, 87, was a Red Cross stretcher-bearer when the German Army invaded the capital city in September 1939. Plucked off the street by German soldiers a year later, he was sent to Auschwitz. He’d been there seven months when the Red Cross arranged for his release in April 1941—one of the few inmates ever set free.
To help carry out the "Final Solution" (the genocide or mass destruction of Jews), the Nazis established killing centers in German-occupied  Poland, the country with the largest Jewish population. Killing centers were designed for efficient mass murder. The first one, which opened in December 1941, was Chelmno, where Jews and Roma were gassed in mobile gas vans. In 1942, the Nazis opened the Belzec, Sobibor, and Treblinka killing centers to systematically murder the Jews of the Generalgouvernement (the territory in the interior of German-occupied Poland).
Camp commandant Rudolf Höss was arrested by the British at a farm near Flensburg, Germany, on 11 March 1946, where he had been working under the pseudonym Franz Lang.[263] He was imprisoned in Heide, then transferred to Minden for interrogation, part of the British occupation zone. From there he was taken to Nuremberg to testify for the defense in the trial of SS-Obergruppenführer Ernst Kaltenbrunner. Höss was straightforward about his own role in the mass murder and said he had followed the orders of Heinrich Himmler.[264][g] Extradited to Poland on 25 May 1946,[265] he wrote his memoirs in custody, first published in Polish in 1951 then in German in 1958 as Kommandant in Auschwitz.[266] His trial before the Supreme National Tribunal in Warsaw opened on 11 March 1947; he was sentenced to death on 2 April and hanged in Auschwitz I, near crematorium I, on 16 April.[267]

As the number of prisoners grew, the camp expanded from the original barracks facility. Auschwitz II-Birkenau, in the nearby village in Brzezinka, underwent construction in October 1941 with the original purpose to house Soviet prisoners of war. Together with Polish inmates, Soviet soldiers were subjected to Zyklon B tests by the camp's SS commanders towards the end of 1941. Beginning in 1942, Jews in massive numbers began to be sent to the camp complex, along with thousands of Roma prisoners. The complex later expanded to include Auschwitz III-Monowitz in October 1942, a slave labor camp providing work for the I.G. Farben industrial complex nearby. By the middle of the war, Auschwitz had grown to include 40 sub-camps in neighboring towns in the region.
Lunch was three quarters of a liter of watery soup at midday, reportedly foul-tasting, with meat in the soup four times a week and vegetables (mostly potatoes and rutabaga) three times. The evening meal was 300 grams of bread, often moldy, part of which the inmates were expected to keep for breakfast the next day, with a tablespoon of cheese or marmalade, or 25 grams of margarine or sausage. Prisoners engaged in hard labor were given extra rations.[114]
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]

The reality of where we were, struck home fairly quickly. I was stationed near crematorium number four, and we witnessed the columns of unsuspecting women and children entering the gate of the crematorium; they would have been dead within half an hour. When the Hungarian Jews arrived they had the gas chambers going day and night. How can you wrap your imagination round that? I still can’t.
On 12 March 1938 the ‘Anschluss’ (‘Annexation’) of austrofascist Austria to the German Reich took place. Two weeks later, the National Socialist Gauleiter (regional head) of Upper Austria, August Eigruber, announced to an enthusiastic audience that his Gau would have the ‘distinction’ of building a concentration camp. The location chosen was the town of Mauthausen on the Danube. Political opponents and groups of people labelled as ‘criminal’ or ‘antisocial’ would be imprisoned here and forced to work in the granite quarries.
German authorities established camps all over Germany on an ad hoc basis to handle the masses of people arrested as alleged subversives. The SS established larger camps in Oranienburg, north of Berlin; Esterwegen, near Hamburg; Dachau, northwest of Munich; and Lichtenburg, in Saxony. In Berlin itself, the Columbia Haus facility held prisoners under investigation by the Gestapo (the German secret state police) until 1936.