Historians increasingly view the Holocaust as a pan-European phenomenon, or a series of holocausts impossible to conduct without the help of local collaborators.[47] Over 200,000 people are estimated to have been Holocaust perpetrators;[48] without them, the Germans would not have been able to extend the Holocaust across most of Europe.[49] Some Christian churches tried to defend the Jews by declaring that converted Jews were "part of the flock," according to Saul Friedländer, "but even then only up to a point". Otherwise, Friedländer writes, "[n]ot one social group, not one religious community, not one scholarly institution or professional association in Germany and throughout Europe declared its solidarity with the Jews."[50]
Before the the Final Solution the plan the Nazis had was to force the Jews to immigration. In 1940 the nazis planed to ship the Jews to an Island in the Indian ocean called Madagascar. it was not until later they referred to the Final Solution as genocide rather than territorial Final Solution. As the nazis were under cover of the war they developed technology to successfully murder millions of Jews. details were worked out at the Wansee Conference. All Jews in Germanys occupied countries were sent to ghettos as holding areas. Many were sent to camps were they worked under brutal conditions. Many were sent to gas chambers. As the Allies advanced death marches cut down the number of potential survivors. Some of Hitler's objectives were to wage to wars at once one aimed at anyone who objected him the other at the Jews. Hitler's success was credited to planed steps and reaction to those of other world powers. 
In the manuscript, her original diaries are written over three extant volumes. The first volume (the red-and-white checkered autograph book) covers the period between June 14 and December 5, 1942. Since the second surviving volume (a school exercise book) begins on December 22, 1943, and ends on April 17, 1944, it is assumed that the original volume or volumes between December 1942 and December 1943 were lost - presumably after the arrest, when the hiding place was emptied on Nazi instructions. However, this missing period is covered in the version Anne rewrote for preservation. The third existing volume (which was also a school exercise book) contains entries from April 17 to August 1, 1944, when Anne wrote for the last time before her arrest.[16]:2
Often, reading Anne Frank's diary is the way in which young people first learn about the horrors of the Nazi genocide. Just as importantly, young readers understand that these crimes were visited upon a girl much like themselves and their friends -- a girl who was often in conflict with her mother, a girl who kept vowing to be a more patient and forgiving person, a girl who fell in love for the first time. A girl who wanted to be a writer -- and who was one.
In the photo below, Captain Franz Hoessler is standing in front of a load of corpses of prisoners who died from typhus at Bergen-Belsen. He is speaking into a microphone for a documentary film made by the British after the Bergen-Belsen camp was turned over to them by Heinrich Himmler on April 15, 1945. He is wearing his SS uniform, but the insignia of his military rank has been removed. Hoessler was convicted by the British and hanged on December 13, 1945 for war crimes that he had committed at Auschwitz-Birkenau, including his participation in the selection of prisoners to be gassed.
Rooted in 19th-century antisemitic discourse on the "Jewish question," "Final Solution" as a Nazi cover term denotes the last stage in the evolution of the Third Reich's anti-Jewish policies from persecution to physical annihilation on a European scale. Currently, Final Solution is used interchangeably with other, broader terms that refer to German extermination policies during World War II, as well as more specifically to describe German intent and the decision-making process leading up to the beginning of systematic mass murder.

Unlike concentration camps, death camps had no barracks to house prisoners, other than those for workers at the camps. In order to process the murder of thousands of people, great pains were taken to deceive the victims concerning their fate. Jews deported from ghettos and concentration camps to the death camps were unaware of what they were facing. The Nazi planners of the operation told the victims that they were being resettled for labor, issued them work permits, told them to bring along their tools and to exchange their German marks for foreign currency. Food was also used to coax starving Jews onto the trains. Once the trains arrived at the death camps, trucks were available to transport those who were too weak to walk directly to the gas chambers. The others were told that they would have to be deloused and enter the baths. The victims were separated by sex and told to remove their clothes. The baths were in reality the gas chambers. The shower heads in the baths were actually the inlets for poison gas. At Auschwitz, the gas chambers held 2,000 people at a time. With the introduction of a cyanide-based gas called Zyklon B, all 2,000 occupants could be killed in five minutes. As a result of this technological “advancement,” Auschwitz was able to “process” the death of 12,000 victims daily. Before the bodies were removed by workers with gas masks and burned in crematoria, the teeth of the victims were stripped for gold, which was melted down and shipped back to Germany. Innocent victims were exploited and desecrated to a degree unknown in human history.
Josef Mengele had hoped to use the “research” he had garnered in Auschwitz in order to produce his Habilitation, a second, post-doctoral, dissertation required for admission to a university faculty as a professor in German-speaking lands. Instead, in January 1945, as the Soviet Army advanced through western Poland, Mengele fled Auschwitz. He spent the next few weeks at the Gross-Rosen concentration camp, until its evacuation. He then made his way west to evade capture by Soviet forces.

Before the war, Mengele had received doctorates in anthropology and medicine, and began a career as a researcher. He joined the Nazi Party in 1937 and the SS in 1938. He was assigned as a battalion medical officer at the start of World War II, then transferred to the Nazi concentration camps service in early 1943 and assigned to Auschwitz, where he saw the opportunity to conduct genetic research on human subjects. His subsequent experiments focused primarily on twins, with little regard for the health or safety of the victims.[2][3]