Question: When did East Germany and The Aggression's country of origin unite?

full_context: Document 1: Ein Herz und eine Seele: The show reflects the life of a petty bourgeois family in West German Wattenscheid, characterised by the social climate of the Willy Brandt era and its political upheavals initiated by the German student movement of 1968. "Ein Herz und eine Seele" makes intensive use of references to German politics and social issues of the early and mid-1970s, when Germany was still divided, not just between East and West, but also (in the case of West Germany) between liberals and conservatives. To feature these tensions in a TV series broke new ground at that time.
Document 2: Flic Story: "Flic Story" follows a nine-year pursuit of Emile Buisson through France during the 1940s and 1950s, and illustrates the pursuit as a battle of intellect, focusing on a growing rapport between Buisson and the protagonist Borniche. Deray's humanizing of the characters was a trait used in his other films, and was a popular counter-cliché concept in France during the 1970s.
Document 3: Arletty: Arletty was imprisoned in 1945 for her wartime liaison with a German Luftwaffe officer, Hans-Jürgen Soehring, during the occupation of France. She allegedly later commented on the experience, "My heart is French but my ass is international." Although other French women fell in love with German soldiers, her romantic affiliation with Soehring during the German occupation prompted a charge of treason.
Document 4: 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 5: 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 6: The Aggression: The Aggression (released in West Germany as Der Angriff and in France as L'agression) is a 1987 West German movie. It is a Heimatfilm. The plot centers around the attempted rape of pharmacist Ilse Trapmann, portrayed by Pascale Petit. The film takes the controversial stance that many West Germans have a latent desire to exert violence, despite the country's appearance to the contrary.
Document 7: White Material: The film stars Isabelle Huppert as Maria Vial, a struggling French coffee producer in an unnamed French speaking African country, who decides to stay at her coffee plantation in spite of an erupting civil war. The film was well received, earning high ratings and appearing in several movie critics' top lists for 2010.
Document 8: 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.
Document 9: 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 10: The Adolescent (film): The Adolescent () is a French drama film directed by Jeanne Moreau in 1978, released January 1979. It was entered into the 29th Berlin International Film Festival. Set deep in the French countryside just before the start of World War II, it shows the often idyllic life of a remote village in the mountainous Auvergne where a family from Paris have come to spend a holiday with relations, an occasion which marks a coming-of-age for their daughter Marie, the adolescent of the title.
Document 11: Spetters: "Spetters" led to protests about how Verhoeven portrayed gays, Christians, the police, and the press. Although Verhoeven made one more film in the Netherlands, the response to "Spetters" led him to leave for Hollywood. Despite the large amount of controversy surrounding it, the film proved to be popular, with 1,124,162 admissions in the Netherlands alone.
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: Shadows of Memory: "Shadows of Memory" caps a series of documentaries von Alemann filmed on the history of Germany, this time turning her lens on the Holocaust. She returns to the town of her family’s origins where the lush landscapes contrast with the jarring truth her mother shares with daughter and granddaughter. Letting their conversation flow naturally, the intimate documentary explores how anti-Semitism developed in Germany and how average citizens ignored the evils of the Holocaust.
Document 14: 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 15: 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.
ground_truth: 1990
sub_queries: The Aggression >> country of origin Answer: West Germany
when did east germany and West Germany unite Answer: 1990