After the eugenics movement was well established in the United States, it was spread to Germany. California eugenicists began producing literature promoting eugenics and sterilization and sending it overseas to German scientists and medical professionals. By 1933, California had subjected more people to forceful sterilization than all other U.S. states combined. The forced sterilization program engineered by the Nazis was partly inspired by California's.
Upon returning from Germany in 1934, where more than 5,000 people per month were being forcibly sterilized, the California eugenics leader C. M. Goethe bragged to a colleague:
"You will be interested to know that your work has played a powerful part in shaping the opinions of the group of intellectuals who are behind Hitler in this epoch-making program. Everywhere I sensed that their opinions have been tremendously stimulated by American thought . . . I want you, my dear friend, to carry this thought with you for the rest of your life, that you have really jolted into action a great government of 60 million people."
Eugenics researcher Harry H. Laughlin often bragged that his Model Eugenic Sterilization laws had been implemented in the 1935 Nuremberg racial hygiene laws. In 1936, Laughlin was invited to an award ceremony at Heidelberg University in Germany (scheduled on the anniversary of Hitler's 1934 purge of Jews from the Heidelberg faculty), to receive an honorary doctorate for his work on the "science of racial cleansing". Due to financial limitations, Laughlin was unable to attend the ceremony and had to pick it up from the Rockefeller Institute. Afterwards, he proudly shared the award with his colleagues, remarking that he felt that it symbolized the "common understanding of German and American scientists of the nature of eugenics."
The racialism and idea of competition, termed social Darwinism in 1944, were discussed by European scientists and also in the Vienna press during the 1920s. Where Hitler picked up the ideas is uncertain. The theory of evolution had been generally accepted in Germany at the time but this sort of extremism was rare. In 1876, Ernst Haeckel had discussed the selective infanticide policy of the Greek city of ancient Sparta.
In his Second Book, which was unpublished during the Nazi era, Hitler praised Sparta, adding that he considered Sparta to be the first "Völkisch State". He endorsed what he perceived to be an early eugenics treatment of deformed children:
Sparta must be regarded as the first Völkisch State. The exposure of the sick, weak, deformed children, in short, their destruction, was more decent and in truth a thousand times more humane than the wretched insanity of our day which preserves the most pathological subject, and indeed at any price, and yet takes the life of a hundred thousand healthy children in consequence of birth control or through abortions, in order subsequently to breed a race of degenerates burdened with illnesses.
In 1934, the first year of the Law's operation, nearly 4,000 persons appealed against the decisions of sterilization authorities. A total of 3,559 of the appeals failed. By the end of the Nazi regime, over 200 Hereditary Health Courts (Erbgesundheitsgerichte) were created, and under their rulings over 400,000 persons were sterilized against their will.
The Law for Simplification of the Health System of July 1934 created Information Centers for Genetic and Racial Hygiene, as well as Health Offices. The law also described procedures for 'denunciation' and 'evaluation' of persons, who were then sent to a Genetic Health Court where sterilization was decided.
Information to determine who was considered 'genetically sick' was gathered from routine information supplied by people to doctor's offices and welfare departments. Standardized questionnaires had been designed by Nazi officials with the help of Dehomag (a subsidiary of IBM in the 1930s), so that the information could be encoded easily onto Hollerith punch cards for fast sorting and counting.
In Hamburg, doctors gave information into a Central Health Passport Archive (circa 1934), under something called the 'Health-Related Total Observation of Life'. This file was to contain reports from doctors, but also courts, insurance companies, sports clubs, the Hitler Youth, the military, the labor service, colleges, etc. Any institution that gave information would get information back in return. In 1940, the Reich Interior Ministry tried to impose a Hamburg-style system on the whole Reich.
Nazi eugenics policies regarding marriage
After the Nazis introduced the Nuremberg racial laws which only allowed Aryans to marry each other, it also became compulsory that both marriage partners had to be tested for any hereditary diseases in order to preserve the perceived racial purity of the Aryan race. Everyone was encouraged to carefully evaluate their prospective marriage partners eugenically during courtship. Members of the SS were cautioned to carefully interview prospective marriage partners to make sure they had no family history of hereditary disease or insanity, but to do this carefully so as not to hurt the feelings of the prospective fiance and, if it became necessary to reject her for eugenic reasons, to do it tactfully and not cause her any offense.
^Haeckel, Ernst (1876). "The History of Creation, vol. I". New York: D. Appleton. p. 170. "Among the Spartans all newly born children were subject to a careful examination or selection. All those that were weak, sickly, or affected with any bodily infirmity, were killed. Only the perfectly healthy and strong children were allowed to live, and they alone afterwards propagated the race."