The United States Holocaust Memorial Museum defines the Holocaust as the "systematic, bureaucratic, state-sponsored persecution and murder of six million Jews by the Nazi regime and its collaborators",[29] distinguishing between the Holocaust and the targeting of other groups during "the era of the Holocaust".[30] According to Yad Vashem, Israel's Holocaust memorial, most historians regard the start of the "Holocaust era" as January 1933, when Hitler was named Chancellor of Germany.[31] Other victims of the Holocaust era include those viewed as inferior, including for reasons of race or ethnicity (such as the Roma, ethnic Poles, Russians, and the disabled); and those targeted because of their beliefs or behavior (such as Jehovah's Witnesses, communists, and homosexuals).[30] Hitler came to see the Jews as "uniquely dangerous to Germany", according to Peter Hayes, "and therefore uniquely destined to disappear completely from the Reich and all territories subordinate to it". The persecution and murder of other groups was much less consistent. For example, he writes, the Nazis regarded the Slavs as "sub-human", but their treatment consisted of "enslavement and gradual attrition", while "some Slavs—Slovaks, Croats, Bulgarians, some Ukrainians—[were] allotted a favored place in Hitler's New Order".[20]
Most of the book is about the privations and hardship of living hidden away in the "annex". There is very little coverage of the violence of the times or much that is going on in the outside world because they had little knowledge of it since they were hidden. I think this is partly why some schoolchildren report the diary is boring. It does get repetitive at times, which reflects the feelings of those living in hiding. They had to wait and wait in fear, not knowing what the next day would bring.

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]
Sources: C.A.N.D.L.E.S; Kor, Eva Mozes. Echoes from Auschwitz. IN.: C.A.N.D.L.E.S. 1995; Lifton, Robert Jay. The Nazi Doctors. The United States: Basic Books. 1986; Nyiszli., Dr. Miklos. Auschwitz: A Doctor's Eyewitness Account. New York: Fawcett Crest. 1960; Posner, Gerald L. and John Ware. Mengele: The Complete Story. New York: Dell Publishing. 1986; Ramati, Alexander. And the Violins Stopped Playing
Throughout German-occupied territory the situation of the Jews was desperate. They had meagre resources and few allies and faced impossible choices. A few people came to their rescue, often at the risk of their own lives. Swedish diplomat Raoul Wallenberg arrived in Budapest on July 9, 1944, in an effort to save Hungary’s sole remaining Jewish community. Over the next six months, he worked with other neutral diplomats, the Vatican, and Jews themselves to prevent the deportation of these last Jews. Elsewhere, Le Chambon-sur-Lignon, a French Huguenot village, became a haven for 5,000 Jews. In German-occupied Poland, where it was illegal to aid Jews and where such action was punishable by death, the Zegota (Council for Aid to Jews) rescued a similar number of Jewish men, women, and children. Financed by the London-based Polish government in exile and involving a wide range of clandestine political organizations, Zegota provided hiding places and financial support and forged identity documents.
Title bestowed by Yad Vashem (the Israeli Holocaust remembrance authority) on certain gentiles who rescued Jews in opposition to Nazi efforts to annihilate them. The distinction is granted according to stringent criteria requiring conclusive evidence. Depending on the nature and extent of help, special kinds of recognition are bestowed upon Christians who saved Jews. To qualify for any one of the distinctions, Christian actions had to involve “extending help in saving a life; endangering one’s own life; absence of reward, monetary and otherwise; and similar considerations which make the rescuers’ deeds stand out above and beyond what can be termed ordinary help.” In part ambiguous, the criteria leave no doubt that those who saved Jews primarily because of payment do not fit the definition of righteous Christians.
Mengele's work also involved carrying out selections, a task that he chose to perform even when he was not assigned to do so, in the hope of finding subjects for his experiments,[33] with a particular interest in locating sets of twins.[34] In contrast to most of the other SS doctors, who viewed selections as one of their most stressful and unpleasant duties, he undertook the task with a flamboyant air, often smiling or whistling a tune.[35][31] He was also one of the SS doctors responsible for supervising the administration of Zyklon B, the cyanide-based pesticide that was used for the mass killings in the Birkenau gas chambers. He served in this capacity at the gas chambers located in crematoria IV and V.[36]
In January 1933, after a bitter ten-year political struggle, Adolf Hitler came to power in Germany. During his rise to power, Hitler had repeatedly blamed the Jews for Germany's defeat in World War I and subsequent economic hardships. Hitler also put forward racial theories asserting that Germans with fair skin, blond hair and blue eyes were the supreme form of human, or master race. The Jews, according to Hitler, were the racial opposite, and were actively engaged in an international conspiracy to keep this master race from assuming its rightful position as rulers of the world.

In 1935, Mengele earned a PhD in anthropology from the University of Munich.[7] In January 1937, he joined the Institute for Hereditary Biology and Racial Hygiene in Frankfurt, where he worked for Dr. Otmar Freiherr von Verschuer, a German geneticist with a particular interest in researching twins.[7] As von Verschuer's assistant, Mengele focused on the genetic factors that result in a cleft lip and palate, or a cleft chin.[10] His thesis on the subject earned him a cum laude doctorate in medicine (MD) from the University of Frankfurt in 1938.[11] (Both of his degrees were revoked by the issuing universities in the 1960s.)[12] In a letter of recommendation, von Verschuer praised Mengele's reliability and his ability to verbally present complex material in a clear manner.[13] The American author Robert Jay Lifton notes that Mengele's published works were in keeping with the scientific mainstream of the time, and would probably have been viewed as valid scientific efforts even outside Nazi Germany.[13]