Question: The Independent Social Democratic Party of Germany, a short-lived political party in Germany during the German Empire and "Deutsches Reich", existed from 1919 to what year?

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Social Democratic Workers' Party of Germany: The Social Democratic Workers' Party of Germany (German: "Sozialdemokratische Arbeiterpartei Deutschlands" , abbreviated as SDAP) was a Marxist socialist political party in the North German Confederation during the period of unification.  Founded in Eisenach in 1869, the SDAP endured through the early years of the German Empire.  Often termed the Eisenachers, the SDAP was one of the first political organizations established among the nascent German labor unions of the nineteenth century.  It officially existed under the name SDAP for only six years (1869–1875), but through name changes and political partnerships its lineage can be traced to the present-day Social Democratic Party of Germany.

Rosa Luxemburg:    (also "Rozalia Luxenburg"; Polish: "Róża Luksemburg" ; 5 March 1871 – 15 January 1919) was a German-Polish Marxist theorist, philosopher, economist, anti-war activist, and revolutionary socialist of Polish-Jewish descent who became a naturalized German citizen.  She was, successively, a member of the Social Democracy of the Kingdom of Poland and Lithuania (SDKPiL), the Social Democratic Party of Germany (SPD), the Independent Social Democratic Party (USPD), and the Communist Party of Germany (KPD).

Socialist Party of Transylvania: The Socialist Party of Transylvania was a political party in Romania, active primarily in Transylvania.  Born out of the ethnic Romanian section of the Social Democratic Party of Hungary (MSZDP), it gradually attracted other socialist and social-democratic groups active in the Transleithanian lands of Austro-Hungary incorporated into the Kingdom of Romania after World War I.  Although initially it claimed, under the title Social Democratic Party of Transylvania and Banat, the adherence of the MSZDP party sections in Banat, the latter, while maintaining close links with the Transylvania party, constituted themselves as a distinct political organization.  The party also actively sought the cooperation of the socialist parties active in other regions of Romania, working towards a unified political party of the working class.  Such plans were however soon thwarted by repression from the part of the Romanian authorities, as well as disagreements both inside the party and among the different socialist formations of Romania.  The disagreements were further aggravated by the request of the Third International that the leaders of the party that had collaborated with the Romanian National Party be excluded from the merger, and eventually resulted in the split between the reformist social-democrats and the revolutionary-minded communists.  While the former decided to retire from unification talks and re-establish an independent Transyvanian party, the latter joined the majority of Socialist Party of Romania (PSR) to create the Communist Party of Romania in May 1921.  The social-democratic faction would late join the PSR members that disagreed with the new orientation of their party, founding the Romanian Social Democratic Party in 1927.

Weimar Republic: Weimar Republic (German: "Weimarer Republik" ] ) was an unofficial, historical designation for the German state between 1919 and 1933.  The name derives from the city of Weimar, where its constitutional assembly first took place.  The official name of the state was "Deutsches Reich"; it had remained unchanged since 1871.  In English the country was usually known simply as Germany.

Majority Social Democratic Party of Germany: The Majority Social Democratic Party of Germany (German: "Mehrheitssozialdemokratische Partei Deutschlands" , MSPD) was the name used by the Social Democratic Party of Germany during the period 1917-1922.  This differentiated it from the more left wing Independent Social Democratic Party of Germany (German: "Unabhängige Sozialdemokratische Partei Deutschlands" , USPD).

Independent Social Democratic Party (Hungary): The Independent Social Democratic Party (Hungarian: "Független Szociáldemokrata Párt" ; FSZDP), was a short-lived political party in Hungary, existed between 1989 and 1993.

Polish Social Democratic Party of Galicia: Polish Social Democratic Party of Galicia (Polish: "Polska Partia Socjalno-Demokratyczna Galicji" ) was a political party in Galicia.  The party was formed in 1890 as the Galician territorial organization of the Social Democratic Workers Party of Austria.  In 1892 it took the name Social Democratic Party of Galicia ("Galicyjska Partia Socjaldemokratyczna" or "Socjaldemokratyczna Partia Galicji").  After an 1899 split, which led to the formation of the Ukrainian Social Democratic Party, the word <nowiki>'</nowiki>Polish<nowiki>'</nowiki> was added to the party name.  It was also known as Polish Social Democratic Party of Galicia and Cieszyn Silesia ("Polska Partia Socjalno-Demokratyczna Galicji i Śląska Cieszyńskiego").  From 1904 it closely worked with Polish Socialist Party, into which it was merged in 1919.

Independent Social Democratic Party of Germany: The Independent Social Democratic Party of Germany (German: "Unabhängige Sozialdemokratische Partei Deutschlands" , USPD) was a short-lived political party in Germany during the German Empire and the Weimar Republic.  The organization was established in 1917 as the result of a split of left wing members of the Social Democratic Party of Germany (SPD).  The organization attempted to chart a centrist course between electorally oriented revisionism on the one hand and bolshevism on the other.  The organization was terminated in 1931 through merger with the Socialist Workers' Party of Germany (SAPD).

Ukrainian Social Democratic Party (1899): Ukrainian Social Democratic Party (USDP) was a political party in Galicia.  The party was founded in 1899 as an autonomous section of the Polish Social Democratic Party of Galicia (and Silesia) by some members of the Polish Social Democratic Party of Galicia (PPSD) and the Ukrainian Radical Party in Lviv.  The key leaders were Mykola Hankevych (party chairman) and Semen Vityk.  It was based on the Ukrainian social democratic organization that already existed since 1897.  The first congress of the party took place in Lviv in 1903.  Few years later in 1906 the party was joined by its affiliate in Bukovina, the Social Democratic Party of Bukovina (leader Yosyp Bezpalko).

Paul Levi: Paul Levi (March 11, 1883 – February 9, 1930) was a German Communist and Social Democratic political leader.  He was the head of the Communist Party of Germany following the assassination of Rosa Luxemburg and Karl Liebknecht in 1919.  After being expelled for publicly criticising Communist Party tactics during the March Action, he formed the which in 1922 merged with the Independent Social Democratic Party.  This party, in turn, merged with the Social Democratic Party a few months later and Levi became one of the leaders of its left wing.

Supporting paragraphs: Independent Social Democratic Party of Germany Weimar Republic
Answer: 1933