Once Germany took over Poland in 1939, it created forced-labor camps. Thousands of prisoners died from working conditions, exhaustion, and starvation. After the outbreak of World War II, the number of concentration camps increased exponentially. The number of prisoners of war camps also rose, but after the first years of the war most were converted into concentration camps. Nazis forcibly relocated Jews from ghettos to concentration camps.
Anti-Jewish measures were introduced in Slovakia, which would later deport its Jews to German concentration and extermination camps.[175] Bulgaria introduced anti-Jewish measures in 1940 and 1941, including the requirement to wear a yellow star, the banning of mixed marriages, and the loss of property. Bulgaria annexed Thrace and Macedonia, and in February 1943 agreed to deport 20,000 Jews to Treblinka; all 11,000 Jews from the annexed territories were sent to their deaths, and plans were made to deport an additional 6,000–8,000 Bulgarian Jews from Sofia to meet the quota.[176] When the plans became public, the Orthodox Church and many Bulgarians protested, and King Boris III canceled the deportation of Jews native to Bulgaria.[177] Instead, they were expelled to the interior pending further decision.[176] Although Hungary expelled Jews who were not citizens from its newly annexed lands in 1941, it did not deport most of its Jews[178] until the German invasion of Hungary in March 1944. Between 15 May and 9 July 1944, 440,000 Hungarian Jews were deported to Auschwitz.[179] In late 1944 in Budapest, nearly 80,000 Jews were killed by the Hungarian Arrow Cross battalions.[180]
The German view of the Roma as hereditary criminals and "asocials" was reflected in their classification in the concentration camps, where they were usually counted among the asocials and given black triangles to wear.[420] According to Niewyk and Nicosia, at least 130,000 died out of nearly one million in German-occupied Europe.[415] The United States Holocaust Memorial Museum calculates at least 220,000.[421] Ian Hancock, who specializes in Romani history and culture, argues for between 500,000 and 1,500,000.[422] The treatment of the Roma was not consistent across German-occupied territories. Those in France and the Low Countries were subject to restrictions on movement and some confinement to collection camps, while those in Central and Eastern Europe were sent to concentration camps and murdered by soldiers and execution squads.[423] Before being sent to the camps, the Roma were herded into ghettos, including several hundred into the Warsaw Ghetto.[219] Further east, teams of Einsatzgruppen tracked down Romani encampments and murdered the inhabitants on the spot, leaving no records of the victims.[423] After the Germans occupied Hungary, 1,000 Roma were deported to Auschwitz.[424][x]

The book’s existence as something of a quasi-novel/biography serves the needs of Young Adult Readers in two very important ways. First, it makes factual accounts accessible and exciting. Rather than dispassionately seek the stark facts of The Holocaust and those who resisted it, readers are able to pathetically experience the suffering and moral conflict. Thus the faculties of imagination and empiricism are both equally engaged. This can lead to more exciting and productive discussions. Second, the reliability of this kind of novel in representing fact portrays the ethical difficulties inherent in The Holocaust. We Goeth as the monstrous sadist and mass murderer, but also as the companion, connoisseur, and host. We see Schindler as the philanthropist, but also as the womanizer and profiteer. The net result is that a Young Adult is presented with an ethical reality in which there are absolutes being encountered by fallible people, people who are not absolute.
British troops guard Alex Pickowski, Camp Commandant of Dechau concentration camp  © The discovery of Belsen brought home the shocking truth about Nazi atrocities, but the facts had been known for some time. As early as the summer of 1941, British signals intelligence had intercepted and decoded radio messages from German police units co-operating with the Einsatzgruppen, and details of the killings of Jews were included in the monthly summaries that were sent to Churchill. Churchill responded with a speech on August 24 1941 in which he called the massacres 'a crime without a name' but erroneously identified the victims as 'Russian patriots defending their native soil'. Otherwise, these facts were not made public.
On April 16, 1945 Soviets surrounded Berlin, Germany’s capital. When the Soviets began advancing towards the Reich Chancellery, Hitler committed suicide on April 30, 1945. Then on May 7th, Germany surrendered to the Western Allies in Reims, France and a few days later to the Soviets in Berlin. All told more than 60 million people, or about 3% of the world’s population at the time, were killed during the course of the Second World War.
Hundreds of prisoners suffered and died, or were executed in medical experiments conducted at KZ Dachau, for which Sigmund Rascher was in charge. Hypothermia experiments involved exposure to vats of icy water or being strapped down naked outdoors in freezing temperatures. Attempts at reviving the subjects included scalding baths, and forcing naked women to copulate with the unconscious victim. Nearly 100 prisoners died during these experiments.[53] The original records of the experiments were destroyed "in an attempt to conceal the atrocities".[a][54]

"During the Holocaust, Germans extinguished the lives of six million Jews and, had Germany not been defeated, would have annihilated millions more. The Holocaust was also the defining feature of German politics and political culture during the Nazi period, the most shocking event of the twentieth century, and the most difficult to understand in all of German history. The Germans' persecution of the Jews culminating in the Holocaust is thus the central feature of Germany during the Nazi period. It is so not because we are retrospectively shocked by the most shocking event of the century, but because of what it meant to Germans at the time and why so many of them contributed to it." Daniel Jonah Goldhagen, Hitler's Willing Executioners, Ordinary Germans and the Holocaust
You find gripping and horrifying stories of Adolf Hitler and his most ruthless henchmen - men often seen as the very personifications of evil, like Rudolf Hoess, the SS Commandant of Auschwitz, the Nazi butcher Amon Goeth at Plaszow and Josef Mengele, The Angel Of Death. You may read about Hitler's wife, Eva Braun, or Admiral Wilhelm Canaris, Chief of the German Military Intelligence who was a dedicated anti-Nazi and held Hitler in utter contempt. He tried to put a stop to the crimes of war and genocide committed by the Nazis.
As Nazi tyranny spread across Europe, the Germans and their collaborators persecuted and murdered millions of other people. Between two and three million Soviet prisoners of war were murdered or died of starvation, disease, neglect, or brutal treatment. The Germans targeted the non-Jewish Polish intelligentsia for killing, and deported millions of Polish and Soviet civilians for forced labor in Germany or in occupied Poland, where these individuals worked and often died under deplorable conditions.
While the labour camps at Auschwitz and Majdanek used inmates for slave labour to support the German war effort, the extermination camps at Belzec, Treblinka, and Sobibor had one task alone: killing. At Treblinka a staff of 120, of whom only 30 were SS (the Nazi paramilitary corps), killed some 750,000 to 925,000 Jews during the camp’s 17 months of operation. At Belzec German records detail a staff of 104, including about 20 SS, who killed some 500,000 Jews in less than 10 months. At Sobibor they murdered between 200,000 and 250,000. These camps began operation during the spring and summer of 1942, when the ghettos of German-occupied Poland were filled with Jews. Once they had completed their missions—murder by gassing, or “resettlement in the east,” to use the language of the Wannsee protocols—the Nazis closed the camps. There were six extermination camps, all in German-occupied Poland, among the thousands of concentration and slave-labour camps throughout German-occupied Europe.
The worst killer was typhus, but typhoid fever and dysentery also claimed many lives. Aggravating the situation was a policy during the final months of transferring already sick inmates from other camps to Belsen, which was then officially designated a sick or convalescence camp (Krankenlager). The sick women of Auschwitz, for example, were transferred to Belsen in three groups in November-December 1944. /12

The evacuation of prisoners from the sub-camps to the main Dachau camp had begun in March 1945, in preparation for surrendering the prisoners to the Allies. The evacuated prisoners had to walk for several days to the main camp because Allied bombs were destroying the railroad tracks as fast as the Germans could repair them. The few trains that did bring prisoners to Dachau, including a train load of women and children, were bombed or strafed by American planes, killing many of the prisoners.

Rzepliñski, Andrzej (25 March 2004). "Prosecution of Nazi Crimes in Poland in 1939–2004" (PDF). First International Expert Meeting on War Crimes, Genocide, and Crimes against Humanity. Lyon, France: International Criminal Police Organization – Interpol General Secretariat. Archived from the original (PDF) on 3 March 2016. Retrieved 31 December 2014.
Dachau, located ten miles north of Munich, Germany, was the first concentration camp built by the Nazis and served as a model for all later camps. By 1937, it held 13,260 prisoners, including German communists and social democrats as well as Jehovah’s Witnesses, Roma (Gypsies), and homosexuals. Dachau also served as the central camp for Christian religious prisoners.

When British and Canadian troops finally entered they found over 13,000 unburied bodies and (including the satellite camps) around 60,000 inmates, most acutely sick and starving. The prisoners had been without food or water for days before the Allied arrival, partially due to allied bombing. Immediately before and after liberation, prisoners were dying at around 500 per day, mostly from typhus.[18] The scenes that greeted British troops were described by the BBC's Richard Dimbleby, who accompanied them: