Q. In which year, the "German reunification " happened?
Answer: 1990
Notes: The "German reunification " happened in 1990. German reunification was the process in 1990 in which the German Democratic Republic (GDR, colloquially East Germany) became part of the Federal Republic of Germany (FRG, colloquially West Germany) to form the reunited nation of Germany, as provided by Article 23 of the FRG's then constitution (Grundgesetz). The end of the unification process is officially referred to as German unity, celebrated each year on 3 October as German Unity Day. Berlin was reunited into a single city, and again became the capital of united Germany.