West Germany was the Federal Republic of Germany from its formation on 23 May 1949 until its reunification with East Germany on 3 October 1990. During the Cold War, the western portion of Germany and the associated territory of West Berlin were parts of the Western Bloc. West Germany was formed as a political entity during the Allied occupation of Germany after World War II, established from 12 states formed in the three Allied zones of occupation held by the United States, the United Kingdom, and France. The capital was the city of Bonn, hence the Cold War-era country is sometimes known as the Bonn Republic.

Germany, officially the Federal Republic of Germany, is a country in the western region of Central Europe. It is the second-most populous country in Europe after Russia, and the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the south. Its 16 constituent states have a total population of over 84 million, covering a combined area of 357,600 km2 (138,100 sq mi) and sharing land borders with Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The nation's capital and most populous city is Berlin and its main financial centre is Frankfurt; the largest urban area is the Ruhr.