Arthur de Gobineau in the context of "Aryanism"

Nordicism is a racialist ideology which views the "Nordic race" (an archaic race concept) as an endangered and superior racial group. Some notable and influential Nordicist works include Madison Grant's book The Passing of the Great Race (1916); Arthur de Gobineau's An Essay on the Inequality of the Human Races (1853); the various writings of Lothrop Stoddard; Houston Stewart Chamberlain's The Foundations of the Nineteenth Century (1899); and, to a lesser extent, William Z. Ripley’s The Races of Europe (1899). The ideology became popular in the late-19th and 20th centuries in Germanic-speaking Europe, Northwestern Europe, Central Europe, and Northern Europe, as well as in North America and Australia.

The belief that Nordic ancestry is superior to all others was originally embraced as "Anglo-Saxonism" in England and the United States, "Teutonicism" in Germany, and "Frankisism" in Northern France. The notion of the superiority of the "Nordic race" and the superiority of the Northwestern European nations that were associated with this supposed race influenced the United States' Immigration Act of 1924 (which effectively banned or severely limited the immigration of Jews, Italians, and other Southern and Eastern Europeans) and the later Immigration and Nationality Act of 1952, and it was also present in other countries outside Northwestern Europe and the United States, such as Australia, Canada, and South Africa. By the 1930s, the Nazis claimed that the Nordic race was the most superior branch of the "Aryan race" and constituted a master race (Herrenrasse). The full application of this belief system—the invasion of Poland and further conquest in the pursuit of Lebensraum, 'living space'—was the immediate catalyst for World War II and led directly to the industrial mass murder of 6 million Jews in what is now known as the Holocaust.