When I was eight years old Czechoslovakia broke apart and we became part of Hungary. That was when our problems started, because the Hungarians were allied with the Nazis. It was a difficult time for Jewish families, as suddenly the law no longer protected us and overnight we lost our civil rights. My father’s lumber business was confiscated and given to a non-Jew, and we received no compensation. Jewish children were thrown out of Hungarian schools, so right away we had no choice but to concentrate on hunkering down and trying not to bring attention to ourselves. We couldn’t ride the trains and we had to wear the yellow star. It was a free for all. With no law to protect us, it was common for Jews to get beaten up or thrown off the train.
Action T4 was a programme of systematic murder of the physically and mentally handicapped and patients in psychiatric hospitals that took place mainly from 1939 to 1941, and continued until the end of the war. Initially the victims were shot by the Einsatzgruppen and others; gas chambers and gas vans using carbon monoxide were used by early 1940. Under the Law for the Prevention of Hereditarily Diseased Offspring, enacted on 14 July 1933, over 400,000 individuals underwent compulsory sterilisation. Over half were those considered mentally deficient, which included not only people who scored poorly on intelligence tests, but those who deviated from expected standards of behaviour regarding thrift, sexual behaviour, and cleanliness. Most of the victims came from disadvantaged groups such as prostitutes, the poor, the homeless, and criminals. Other groups persecuted and killed included Jehovah's Witnesses, homosexuals, social misfits, and members of the political and religious opposition.
To complete this mission, Hitler ordered the construction of death camps. Unlike concentration camps, which had existed in Germany since 1933 and were detention centers for Jews, political prisoners and other perceived enemies of the Nazi state, death camps existed for the sole purpose of killing Jews and other “undesirables,” in what became known as the Holocaust.
An older use of Nazi for national-sozial is attested in German from 1903, but EWdS does not think it contributed to the word as applied to Hitler and his followers. The NSDAP for a time attempted to adopt the Nazi designation as what the Germans call a "despite-word," but they gave this up, and the NSDAP is said to have generally avoided the term. Before 1930, party members had been called in English National Socialists, which dates from 1923. The use of Nazi Germany, Nazi regime, etc., was popularized by German exiles abroad. From them, it spread into other languages, and eventually was brought back to Germany, after the war. In the USSR, the terms national socialist and Nazi were said to have been forbidden after 1932, presumably to avoid any taint to the good word socialist. Soviet literature refers to fascists.
Despite these strengths, the Nazi Party might never have come to power had it not been for the Great Depression and its effects on Germany. By 1930, the German economy was beset with mass unemployment and widespread business failures. The Social Democrats and Communists were bitterly divided and unable to formulate an effective solution: this gave the Nazis their opportunity and Hitler's message, blaming the crisis on the Jewish financiers and the Bolsheviks, resonated with wide sections of the electorate. At the September 1930 Reichstag elections, the Nazis won 18.3% of the votes and became the second-largest party in the Reichstag after the Social Democrats. Hitler proved to be a highly effective campaigner, pioneering the use of radio and aircraft for this purpose. His dismissal of Strasser and his appointment of Goebbels as the party's propaganda chief were major factors. While Strasser had used his position to promote his own leftish version of national socialism, Goebbels was totally loyal to Hitler and worked only to improve Hitler's image.
Use of the word "concentration" came from the idea of confining people in one place because they belong to a group that is considered undesirable in some way. The term itself originated in 1897 when the "reconcentration camps" were set up in Cuba by General Valeriano Weyler. In the past, the U.S. government had used concentration camps against Native Americans and the British had also used them during the Second Boer War. Between 1904 and 1908, the Schutztruppe of the Imperial German Army operated concentration camps in German South-West Africa (now Namibia) as part of its genocide of the Herero and Namaqua peoples. The Shark Island Concentration Camp in Lüderitz was the largest camp and the one with the harshest conditions.