At the dawn of World War II, Hitler came to believe that restricting the daily activities of Jews in Germany and the countries annexed by the Nazis would not resolve what he considered to be his “Jewish problem.” Nor would isolated acts of violence against Jews serve a purpose. Instead, the chancellor determined that the sole solution would be the elimination of every European Jew.
Defined by the religion of their grandparents rather than by their own beliefs, Jews were viewed as having impure blood lines. The new laws were taught in schools, cementing anti-Semitism in German culture. Most Germans kept quiet, often benefiting when Jews lost jobs and businesses. Persecution of other minorities also escalated: the police were given new powers to arrest homosexuals and compulsory abortions were administered to women considered to be ‘hereditarily ill’.
In March 1944, part of the camp was redesignated as an Erholungslager ("recovery camp"),[11] where prisoners too sick to work were brought from other concentration camps. They were in Belsen supposedly to recover and then return to their original camps and resume work, but many of them died in Belsen of disease, starvation, exhaustion and lack of medical attention.[12]
At the same time this little boy miraculously survived the same camp, Bergen-Belsen! More than any other photos, this famous photograph captures the essence of the horrors of Holocaust: Warsaw 1943, a little Jewish boy dressed in short trousers and a cap, raises his arms in surrender with lowered eyes, as a Nazi soldier trains his machine gun on him. 
Today, nothing remains of the camp because the British immediately burned down every structure to prevent the further spread of typhus. What is left is a graveyard, “the largest Jewish cemetery in Western Europe,” according to Renee Ghert-Zand. She notes that “there are no grave markers or monuments save for a small number of symbolic ones, placed in recent years by family members or memorial foundations to supplement a number of official monuments erected on the site in the late 1940s and early ’50s.” Nearby, another cemetery was built after liberation as the final resting place for 4,500 Jews and Christians. Most of the graves are umarked, and several of those with grave stones say only, “Here lies an unknown deceased.”

Moshe Peer has spent many years writing a first-person account of the horror he witnessed at Bergen-Belsen. He recalls the separation from his parents as excruciating. But surviving the horrors of the camp quickly became a priority: `There were pieces of corpses lying around and there were bodies lying there, some alive and some dead,` Peer recalled,  `Bergen-Belsen was worse than Auschwitz because there people were gassed right away so they didn't suffer a long time ...` Russian prisoners were kept in an open-air camp and were given no food or water. `Some people went mad with hunger and turned to cannibalism.`
Approximately 30,00 Jewish men were arrested during the pogrom, allegedly for their own protection, and taken to the 3 major concentration camps in Germany, including 10,911 who were brought to Dachau and held as prisoners while they were pressured to sign over their property and leave the country. The majority of these Jews were released within a few weeks, after they promised to leave Germany within six months; most of them wound up in Shanghai, the only place that did not require a visa, because other countries, except Great Britain, refused to take them.
"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

Three defendants were acquitted. However, many of the Nazis who perpetrated the Holocaust were never tried or punished, including Hitler who had committed suicide. Since then, the international community has continued and improved accountability through forums such as the International Criminal Court, and the International Criminal Tribunal for Rwanda.
The first thing that visitors are told by their tour guides at Dachau is that the "Arbeit Macht Frei" sign was put up to taunt the prisoners who had no chance of being set free because the policy of the Dachau camp was extermination through work. Actually, the Arbeit Macht Frei sign was only put on Class 1 camps where prisoners had a good chance of being released. Buchenwald was a Class II camp where the sign on the gate said "Jedem das Seine," which means "To each his own." Mauthausen was a Class III camp where the prisoners were designated "Return unwanted" and there was no sign at all.
The first such extermination camps were introduced during Operation Reinhardt, which targeted the elimination of the Jewish people within the General Government of Occupied Poland and Ukraine. After the first killing center open at Chelmno, the use of these extermination tactics spread quickly. At the height of deportations, the Birkenau killing center murdered 6,000 Jews a day.

The deportation of Jews to the ghettos culminated in the policy of extermination the Nazis called the "Final Solution to the Jewish Question", discussed by senior Nazi officials at the Wannsee Conference in Berlin in January 1942. As German forces captured territories in the East, all anti-Jewish measures were radicalized. Under the coordination of the SS, with directions from the highest leadership of the Nazi Party, killings were committed within Germany itself, throughout occupied Europe, and across all territories controlled by the Axis powers. Paramilitary death squads called Einsatzgruppen, in cooperation with Wehrmacht police battalions and local collaborators, murdered around 1.3 million Jews in mass shootings between 1941 and 1945. By mid-1942, victims were being deported from the ghettos in sealed freight trains to extermination camps where, if they survived the journey, they were killed in gas chambers. The killing continued until the end of World War II in Europe in May 1945.
At the same time this little boy miraculously survived the same camp, Bergen-Belsen! More than any other photos, this famous photograph captures the essence of the horrors of Holocaust: Warsaw 1943, a little Jewish boy dressed in short trousers and a cap, raises his arms in surrender with lowered eyes, as a Nazi soldier trains his machine gun on him. 
The Nazis used the phrase Lebensunwertes Leben (life unworthy of life) in reference to the disabled and mentally ill.[92] On 14 July 1933, the Law for the Prevention of Hereditarily Diseased Offspring (Gesetz zur Verhütung erbkranken Nachwuchses), the Sterilization Law, was passed, allowing for compulsory sterilization.[93][94] The New York Times reported on 21 December that year: "400,000 Germans to be sterilized".[95] There were 84,525 applications from doctors in the first year. The courts reached a decision in 64,499 of those cases; 56,244 were in favor of sterilization.[96] Estimates for the number of involuntary sterilizations during the whole of the Third Reich range from 300,000 to 400,000.[97]
After invading Poland, the Germans established ghettos in the incorporated territories and General Government to confine Jews.[143] The ghettos were formed and closed off from the outside world at different times and for different reasons.[196][197] For example, the Łódź ghetto was closed in April 1940,[143] to force the Jews inside to give up money and valuables;[198] the Warsaw ghetto was closed for health considerations (for the people outside, not inside, the ghetto),[199] but this did not happen until November 1940;[143] and the Kraków ghetto was not established until March 1941.[200] The Warsaw Ghetto contained 380,000 people[143] and was the largest ghetto in Poland; the Łódź Ghetto was the second largest,[201] holding between 160,000[202] to 223,000.[203] Because of the long drawn-out process of establishing ghettos, it is unlikely that they were originally considered part of a systematic attempt to eliminate Jews completely.[204]
In April 1943, a part of the Bergen-Belsen camp was taken over by the SS Economic-Administration Main Office (SS Wirtschafts-Verwaltungshauptamt; WVHA). It thus became part of the concentration camp system, run by the SS Schutzstaffel but it was a special case.[7] Having initially been designated a Zivilinterniertenlager ("civilian internment camp"), in June 1943 it was redesignated Aufenthaltslager ("holding camp"), since the Geneva Conventions stipulated that the former type of facility must be open to inspection by international committees.[8] This "holding camp" or "exchange camp" was for Jews who were intended to be exchanged for German civilians interned in other countries, or for hard currency.[9] The SS divided this camp into subsections for individual groups (the "Hungarian camp", the "special camp" for Polish Jews, the "neutrals camp" for citizens of neutral countries and the "Star camp" for Dutch Jews). Between the summer of 1943 and December 1944 at least 14,600 Jews, including 2,750 children and minors were transported to the Bergen-Belsen "holding" or exchange camp.[10]:160 Inmates were made to work, many of them in the "shoe commando" which salvaged usable pieces of leather from shoes collected and brought to the camp from all over Germany and occupied Europe. In general the prisoners of this part of the camp were treated less harshly than some other classes of Bergen-Belsen prisoner until fairly late in the war, due to their perceived potential exchange value.[9] However, only around 2,560 Jewish prisoners were ever actually released from Bergen-Belsen and allowed to leave Germany.[9]