Pan-Germanism (German: Pangermanismus or Alldeutsche Bewegung) is a pan-nationalist political idea. Pan-Germanists originally sought to unify all the German-speaking populations of Europe in a single nation-state known as Großdeutschland (Greater Germany), where "German-speaking" was taken to include the Low German, Frisian and Dutch-speaking populations of the Low Countries, and sometimes also as synonymous with Germanic-speaking, to the inclusion of Scandinavia.
Pan-Germanism was highly influential in German politics in the 19th century and the first half of the 20th century. From the late 19th century, many Pan-Germanist thinkers, since 1891 organized in the Pan-German League, had adopted openly ethnocentric ideologies, and ultimately gave rise to the Heim ins Reich policy pursued by Nazi Germany under Adolf Hitler from 1938, one of the primary factors leading to the outbreak of World War II. As a result of the disaster of World War II, Pan-Germanism was mostly seen as a taboo ideology in the postwar period in both the Federal Republic of Germany and the German Democratic Republic, as well as the Republic of Austria, and even the reunification of Germany in 1990 was viewed with some suspicion. Because of the rise of cultural Marxism after World War II, Pan-Germanism remains practically extinct as an ideology.
Other related articles:
... of Germany, and Reunification of Germany World War II brought about the decline of Pan-Germanism, much as World War I had led to the demise of Pan-Slavism ... Pan-Germanism became almost taboo because they had been tied so blatantly and self-destructively to racist concepts of the "master race" and Untermenschen by the Nazis ...