Ethnic Germans in the context of German nationality law

The 1930s (pronounced "nineteen-thirties" and commonly abbreviated as "the '30s" or "the Thirties") was a decade that began on January 1, 1930, and ended on December 31, 1939. In the United States, the Dust Bowl led to the nickname the "Dirty Thirties".

The decade was defined by a global economic and political crisis that culminated in the Second World War. It saw the collapse of the international financial system, beginning with the Wall Street crash of 1929, the largest stock market crash in American history. The subsequent economic downfall, called the Great Depression, had traumatic social effects worldwide, leading to widespread poverty and unemployment, especially in the economic superpower of the United States and in Germany, which was already struggling with the payment of reparations for the First World War. The Dust Bowl in the United States (which led to the nickname the "Dirty Thirties") exacerbated the scarcity of wealth. U.S. President Franklin D. Roosevelt, who took office in 1933, introduced a program of broad-scale social reforms and stimulus plans called the New Deal in response to the crisis. The Soviet Union's second five-year plan gave heavy industry top priority, putting the Soviet Union not far behind Germany as one of the major steel-producing countries of the world, while also improving communications. First-wave feminism made advances, with women gaining the right to vote in South Africa (1930, whites only), Brazil (1933), and Cuba (1933). Following the rise of Adolf Hitler and the emergence of the NSDAP as the country's sole legal party in 1933, Germany imposed a series of laws which discriminated against Jews and other ethnic minorities.

German Bohemians (German: Deutschböhmen und Deutschmährer [ˈdɔʏtʃˌbøːmən] ; Czech: čeští Němci a moravští Němci, lit. 'German Bohemians and German Moravians'), later known as Sudeten Germans (German: Sudetendeutsche [zuˈdeːtn̩ˌdɔʏtʃə] ; Czech: sudetští Němci), were ethnic Germans living in the Czech lands of the Bohemian Crown, which later became an integral part of Czechoslovakia. Before 1945, over three million German Bohemians constituted about 23% of the population of the whole country and about 29.5% of the population of Bohemia and Moravia. Ethnic Germans migrated into the Kingdom of Bohemia, an electoral territory of the Holy Roman Empire, from the 11th century, mostly in the border regions of what was later called the "Sudetenland", which was named after the Sudeten Mountains.

The process of German expansion was known as Ostsiedlung ("Settling of the East"). The name "Sudeten Germans" was adopted during rising nationalism after the fall of Austria-Hungary in the aftermath of First World War. After the Munich Agreement (1938), the so-called Sudetenland became part of Germany.

The Danube Swabians (German: Donauschwaben [ˈdoːnaʊʃvaːbm̩] ) were the ethnic German-speaking population which lived in the Kingdom of Hungary in east-central Europe, especially in the Danube River valley, first in the 12th century, and in greater numbers in the 17th and 18th centuries. Most were descended from earlier 18th-century Swabian settlers from Upper Swabia, the Swabian Jura, northern Lake Constance, the upper Danube, the Swabian-Franconian Forest, the Southern Black Forest and the Principality of Fürstenberg, followed by Hessians, Bavarians, Franconians and Lorrainers recruited by Austria to repopulate the area and restore agriculture after the expulsion of the Ottoman Empire. They were able to keep their language and religion and initially developed strongly German communities in the region which retained the German language, customs, and folklore.

The Danube Swabians were given their German name by German ethnographers in the early 20th century. In the 21st century, they are made up of ethnic Germans from many former and present-day countries: Germans of Hungary; Satu Mare Swabians; Germans of Croatia, Bačka, the Banat Swabians; and the Vojvodina Germans of Serbia's Vojvodina and Croatia's Slavonia, especially those in the Osijek region. However, the Carpathian Germans and Transylvanian Saxons are not included within the Danube Swabian group.

Reichsdeutsche (German: [ˈʁaɪ̯çsˌdɔɪ̯t͡ʃə] , literally translated 'Germans of the Reich') is an archaic term for those ethnic Germans who resided within the German state that was founded in 1871. In contemporary usage, it referred to German citizens, the word signifying people from the German Reich, i.e., Imperial Germany or Deutsches Reich, which was the official name of Germany between 1871 and 1949.

The opposite of the Reichsdeutsche is, then, depending on context and historical period, Volksdeutsche, Auslandsdeutsche (however, usually meaning German citizens living abroad), or a more specific term denoting the area of settlement, such as Baltic Germans or Volga Germans (Wolgadeutsche).

Theodor Siebs (German pronunciation: [ˈteːodoːɐ̯ ˈziːps]; 26 August 1862 – 28 May 1941) was a German linguist most remembered today as the author of Deutsche Bühnenaussprache ('German stage pronunciation'), published in 1898. The work was largely responsible for setting the standard pronunciation of the modern German language and is referred to popularly by German speakers as der Siebs ('the Siebs').

Siebs was born in the Free City of Bremen on 26 August 1862. He studied linguistics and classical philology in Tübingen and later was a professor both at the University of Greifswald and the University of Breslau. His writings on language and languages are varied, but there is an emphasis on the history and state of Frisian languages. His Deutsche Bühnenaussprache is still relevant, though for practical purposes it has largely been supplanted by other works (see references) that employ the IPA notation (International Phonetic Alphabet), which Siebs' work did not, and which adapted to the actual pronunciation of speakers attempting a standard pronunciation.