Question: When did East Germany and the country where Ute Scheiffele is a citizen unite?

full_context: Document 1: Germany: After Germany surrendered, the Allies partitioned Berlin and Germany's remaining territory into four military occupation zones. The western sectors, controlled by France, the United Kingdom, and the United States, were merged on 23 May 1949 to form the Federal Republic of Germany (Bundesrepublik Deutschland); on 7 October 1949, the Soviet Zone became the German Democratic Republic (Deutsche Demokratische Republik). They were informally known as West Germany and East Germany. East Germany selected East Berlin as its capital, while West Germany chose Bonn as a provisional capital, to emphasize its stance that the two - state solution was an artificial and temporary status quo.
Document 2: Dresden: Since German reunification in 1990 Dresden is again a cultural, educational and political centre of Germany and Europe. The Dresden University of Technology is one of the 10 largest universities in Germany and part of the German Universities Excellence Initiative. The economy of Dresden and its agglomeration is one of the most dynamic in Germany and ranks first in Saxony.  It is dominated by high-tech branches, often called “Silicon Saxony”. The city is also one of the most visited in Germany with 4.3 million overnight stays per year. The royal buildings are among the most impressive buildings in Europe. Main sights are also the nearby National Park of Saxon Switzerland, the Ore Mountains and the countryside around Elbe Valley and Moritzburg Castle. The most prominent building in the city of Dresden is the Frauenkirche. Built in the 18th century, the church was destroyed during World War II. The remaining ruins were left for 50 years as a war memorial, before being rebuilt between 1994 and 2005.
Document 3: Karl Sutter: Born in Basel, Switzerland, he was a member of FC Freiburg sports club and chose to compete internationally for Germany. His first success at national level came in 1937, when he was runner-up at the German Athletics Championships to Julius Müller. He only reached the national podium on one more occasion, in 1939 when he was second to Austria's Josef Haunzwickel (who competed due to the Anschluss).
Document 4: States of Germany: After the Nazi Party seized power in January 1933, the Länder increasingly lost importance. They became administrative regions of a centralised country. Three changes are of particular note: on January 1, 1934, Mecklenburg-Schwerin was united with the neighbouring Mecklenburg-Strelitz; and, by the Greater Hamburg Act (Groß-Hamburg-Gesetz), from April 1, 1937, the area of the city-state was extended, while Lübeck lost its independence and became part of the Prussian province of Schleswig-Holstein.
Document 5: History of Germany (1945–1990): The intended governing body of Germany was called the Allied Control Council. The commanders - in - chief exercised supreme authority in their respective zones and acted in concert on questions affecting the whole country. Berlin, which lay in the Soviet (eastern) sector, was also divided into four sectors with the Western sectors later becoming West Berlin and the Soviet sector becoming East Berlin, capital of East Germany.
Document 6: Ute Scheiffele: Ute Scheiffele, née Gähler (born 12 February 1941), is a German luger who competed in the 1960s for East and West Germany. She was born in Oybin, Sachsen, East Germany. She never won any medals on World, European or Olympic games with the best result fourth in the 1963 World Championship in Imst, Austria. In 1964 she fled to Bavaria and started for West Germany at the 1968 Winter Olympics in Grenoble.
Document 7: Ute Wetzig: Ute Wetzig (born April 11, 1971 in Halle an der Saale, Sachsen-Anhalt) is a female diver from Germany, who won a gold, a silver and a bronze medal in the women's 10 m platform event at the European Championships in the early 1990s.
Document 8: Stefan Gaisreiter: Stefan Gaisreiter (born 10 December 1947 in Murnau am Staffelsee) is a West German bobsledder who competed from the late 1960s to the late 1970s. He won a bronze medal in the four-man event at the 1972 Winter Olympics in Sapporo.
Document 9: Marga Faulstich: A talented young woman, Faulstich quickly advanced in her career – from graduate assistant to technician, then to scientific assistant, and finally to scientist. Her fiancé died in the Second World War, and from then on, she focused only on her career. In 1942 she studied chemistry while continuing to work at Schott. She could not finish her studies because the situation changed after the Second World War. Jena belonged to the Soviet occupation zone; however, the most advanced glassmaking facility in the world was located in Jena and the Western Allies wanted to obtain and use this know-how. Therefore, 41 specialists and managers of Schott AG were brought to the western sector, including Marga Faulstich.
Document 10: Sylke Otto: Sylke Otto (born 7 July 1969 in Karl-Marx-Stadt) is a former German luger who competed from 1991 to 2007. Competing in three Winter Olympics, she won the gold medal in the women's singles event in 2002 and 2006.
Document 11: Uschi Obermaier: Ursula "Uschi" Obermaier (September 24, 1946) is a former fashion model and actress associated with the 1968 left-wing movement in Germany. She is considered an iconic sex symbol of the so-called "1968 generation" and the protests of 1968.
Document 12: Unification of Germany: The unification of Germany into a politically and administratively integrated nation state officially occurred on 18 January 1871, in the Hall of Mirrors at the Palace of Versailles in France. Princes of the German states, excluding Austria, gathered there to proclaim Wilhelm I of Prussia as German Emperor after the French capitulation in the Franco - Prussian War. Unofficially, the de facto transition of most of the German - speaking populations into a federated organization of states had been developing for some time through alliances formal and informal between princely rulers -- but in fits and starts; self - interests of the various parties hampered the process over nearly a century of autocratic experimentation, beginning in the era of the Napoleonic Wars, which saw the dissolution of the Holy Roman Empire of the German Nation (1806), and the subsequent rise of German nationalism.
Document 13: German reunification: The German reunification (German: Deutsche Wiedervereinigung) was the process in 1990 in which the German Democratic Republic (GDR / DDR / East Germany) joined the Federal Republic of Germany (FRG / West Germany) to form the reunited nation of Germany, and when Berlin reunited into a single city, as provided by its then Grundgesetz constitution Article 23. The end of the unification process is officially referred to as German unity (German: Deutsche Einheit), celebrated on 3 October (German Unity Day) (German: Tag der deutschen Einheit). Following German reunification, Berlin was once again designated as the capital of united Germany.
Document 14: Berlin Wall: In 1989 a series of revolutions in nearby Eastern Bloc countries -- Poland and Hungary in particular -- caused a chain reaction in East Germany that ultimately resulted in the demise of the Wall. After several weeks of civil unrest, the East German government announced on 9 November 1989 that all GDR citizens could visit West Germany and West Berlin. Crowds of East Germans crossed and climbed onto the Wall, joined by West Germans on the other side in a celebratory atmosphere. Over the next few weeks, euphoric people and souvenir hunters chipped away parts of the Wall; the governments later used industrial equipment to remove most of what was left. The ``fall of the Berlin Wall ''paved the way for German reunification, which formally took place on 3 October 1990.
Document 15: Territorial evolution of Germany: The territorial changes of Germany include all changes in the borders and territory of Germany from its formation in 1871 to the present. Modern Germany was formed in 1871 when Otto von Bismarck unified most of the German states, with the notable exception of Austria, into the German Empire. After the First World War, Germany lost about 10% of its territory to its neighbours and the Weimar Republic was formed. This republic included territories to the east of today's German borders.
ground_truth: 1990
sub_queries: Ute Scheiffele >> country of citizenship Answer: West Germany
when did east germany and West Germany unite Answer: 1990