The U.S. was the global leader in codified racism, and its race laws fascinated the Germans. The "National Socialist Handbook for Law and Legislation" of 1934–35, edited by the lawyer Hans Frank, contains a pivotal essay by Herbert Kier on the recommendations for race legislation which devoted a quarter of its pages to U.S. legislation—from segregation, race based citizenship, immigration regulations, and anti-miscegenation. Hitler and other Nazis praised America's system of institutional racism and believed that it was the model which should be followed in their Reich. In particular, they believed that it was the model for the expansion of German territory into the territories of other nations and the elimination of their indigenous inhabitants, as well as the model for the implementation of racist immigration laws which banned some races, and laws which denied full citizenship to blacks, which they also wanted to implement against Jews. Hitler's book "Mein Kampf" extolled America as the only contemporary example of a country with racist ("völkisch") citizenship statutes in the 1920s, and Nazi lawyers made use of American models when they crafted their own laws in Nazi Germany. U.S. citizenship laws and anti-miscegenation laws directly inspired the two principal Nuremberg Laws—the Citizenship Law and the Blood Law. Establishing a restrictive entry system for Germany, Hitler admiringly wrote: "The American Union categorically refuses the immigration of physically unhealthy elements, and simply excludes the immigration of certain races."