paragraph_text: Henderson Bluff () is a rock bluff, high, along the west side of Lexington Table north of Mount Lechner, in the Forrestal Range of the Pensacola Mountains, Antarctica. It was mapped by the United States Geological Survey from surveys and U.S. Navy air photos, 1956–66, and was named by the Advisory Committee on Antarctic Names for John R. Henderson, a geophysicist in the Pensacola Mountains, 1965–66.

paragraph_text: Imshaug Peninsula () is a broad, snow-covered peninsula at the south side of Lehrke Inlet on the east coast of Palmer Land, Antarctica. It was mapped by the United States Geological Survey in 1974, and named by the Advisory Committee on Antarctic Names for Henry A. Imshaug, a United States Antarctic Research Program biologist working in a long-range biosystematic study of subantarctic floras with research at the Juan Fernández Islands, 1965–66; the Falkland Islands, 1967–68; the Chilean Archipelago, 1969; Campbell Island, 1969–70; and the Kerguelen Islands, 1970–71.

paragraph_text: Mount Stroschein is a mountain in Antarctica, 1,020 m, standing 2 nautical miles (3.7 km) southwest of Weber Ridge in the Anderson Hills in northern Patuxent Range, Pensacola Mountains. It was mapped by the United States Geological Survey (USGS) from surveys and U.S. Navy air photos from 1956-66. It was named by US-ACN for Leander A. Stroschein, a meteorologist at Plateau Station in 1965–66 and 1966-67.

paragraph_text: The 1980–81 Bundesliga was the 18th season of the Bundesliga, West Germany's premier football league. It began on 15 August 1980 and ended on 13 June 1981. Bayern Munich were the defending champions.

paragraph_text: Henderson Glacier is a glacier about long in the Enterprise Hills of the Heritage Range, Antarctica. It flows northeast from Schoeck Peak and Hoinkes Peak to enter Union Glacier just east of Mount Rossman. Henderson Glacier was mapped by the United States Geological Survey from surveys and U.S. Navy air photos 1961–66, and was named by the Advisory Committee on Antarctic Names for Felix E. Henderson, a United States Antarctic Research Program meteorologist at Eights Station in 1965.

paragraph_text: Mount Keinath () is a mountain, high, rising at the east side of the terminus of Boomerang Glacier in the Deep Freeze Range, Victoria Land, Antarctica. It was mapped by the United States Geological Survey from surveys and U.S. Navy air photos, 1955–63, and was named by the Advisory Committee on Antarctic Names for Gerald E. Keinath, a biolab administrator at McMurdo Station in the 1965–66 season.

paragraph_text: The Harrow Peaks are a group of rugged peaks in the eastern part of the Random Hills, bounded on the north by Clausnitzer Glacier and on the east by Tinker Glacier, overlooking the northwestern extremity of Wood Bay on the coast of Victoria Land, Antarctica. They were mapped by the United States Geological Survey from surveys and U.S. Navy air photos, 1955–63, and were named by the Advisory Committee on Antarctic Names for Geoffrey N. Harrow, a biologist at McMurdo Station, 1965–66 season.

paragraph_text: Elvers Peak () is a peak, high, at the southeast end of the Edson Hills in the Heritage Range, Antarctica. It was mapped by the United States Geological Survey from surveys and U.S. Navy air photos, 1961–66, and was named by the Advisory Committee on Antarctic Names for Douglas J. Elvers, a seismologist on the United States Antarctic Research Program South Pole—Queen Maud Land Traverse II, in 1965–66.

paragraph_text: The 1969–70 Bundesliga was the seventh season of the Bundesliga, West Germany's premier football league. It began on 16 August 1969 and ended on 7 June 1970. Bayern Munich were the defending champions.

paragraph_text: Isabelle Linden began her junior career at VfR Fischenich and SC Fortuna Köln before joining the senior team of SC Fortuna Köln. She played for SGS Essen before joining Fußball-Bundesliga side Bayer 04 Leverkusen in 2009. She moved to 1. FFC Frankfurt ahead of the 2015–16 season.

paragraph_text: Miller Nunatak () is a sharp pointed nunatak rising above the ice at the lower end of Campbell Glacier, east-southeast of Mount Dickason, in Victoria Land, Antarctica. It was mapped by the United States Geological Survey from surveys and U.S. Navy air photos, 1955–63, and was named by the Advisory Committee on Antarctic Names for Herman T. Miller, a biologist at McMurdo Station in the 1965–66 season.

paragraph_text: The 1965–66 Bundesliga was the third season of the Bundesliga, West Germany's premier football league. It began on 14 August 1965 and ended on 28 May 1966. Werder Bremen were the defending champions.

paragraph_text: The 1986–87 Bundesliga was the 24th season of the Bundesliga, the premier football league in West Germany. It began on 8 August 1986 and ended on 17 June 1987. FC Bayern Munich were the defending champions.

paragraph_text: Johnson Neck is a relatively low, ice-drowned neck of land, or isthmus, which joins the Dott Ice Rise to the east side of the Pioneer Heights in the Heritage Range of the Ellsworth Mountains, Antarctica. It was mapped by the United States Geological Survey from surveys and U.S. Navy air photos, 1961–66, and was named by the Advisory Committee on Antarctic Names for Douglas J. Johnson, a meteorologist at Byrd Station in 1965.

paragraph_text: RAMA is the largest association of Russian professionals outside of Russia, irrespective of the specialty. There are 66 full members from 40 states of the United States, and Canada, Russia, other CIS countries, England, Germany, Israel, Estonia and South Africa. The database of the Association includes more than 800 Russian-speaking physicians and other medical professionals.

paragraph_text: The 2009–10 season of the 2nd Fußball-Bundesliga (women) is the sixth season of Germany's second-tier women's football league. It began on 20 September 2009 and the date set for the final relegation game is 30 May 2009. Herforder SV Borussia Friedenstal and Bayer Leverkusen achieved promotion to the Bundesliga.

paragraph_text: The 2011–12 Bundesliga was the 49th season of the Bundesliga, Germany's premier football league. The season started on 5 August 2011 with the opening match involving defending champions Borussia Dortmund and ended with the last games on 5 May 2012. The traditional winter break was held between the weekends around 17 December 2011 and 20 January 2012.

paragraph_text: The Deutscher Fußball-Verband der DDR (DFV) was from 1958 the football association of the (East) German Democratic Republic, fielding the East Germany national football team until 1990 before rejoining its counterpart, the German Football Association (DFB), which had been founded in 1900.

paragraph_text: ESV Kaufbeuren is a professional ice hockey team based in Kaufbeuren, Germany. They currently play in DEL2, the second level of ice hockey in Germany. Prior to the 2013–14 season they played in the 2nd Bundesliga.

paragraph_text: 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.

Question: When did East Germany and the country that hosted the 1965–66 season of the Bundesliga football league unite?
Answer: 1990