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Since the Ber- firstly sounds just like the German word Bär , a bear appears in the coat of arms of the city. ) is the capital and largest city of Germany by each space and population. Its 3,769,495 inhabitants make it probably the most populous metropolis proper of the European Union. It is surrounded by the state of Brandenburg, and contiguous with Potsdam, Brandenburg's capital.Although it was possible for Westerners to move to the other facet via strictly managed checkpoints, for many Easterners journey to West Berlin or West Germany was prohibited by the federal government of East Germany. In 1971, a Four-Power agreement guaranteed entry to and from West Berlin by automobile or prepare through East Germany. In the early 20th century, Berlin had turn out to be a fertile ground for the German Expressionist movement. In fields similar to structure, painting and cinema new forms of artistic styles had been invented.Typical Germanised place name suffixes of Slavic origin are -ow, -itz, -vitz, -witz, -itzsch and -in, prefixes are Windisch and Wendisch. The name Berlin has its roots within the language of West Slavic inhabitants of the realm of today's Berlin, and may be associated to the Old Polabian stem berl-/birl- ("swamp").During the Weimar era, Berlin underwent political unrest due to financial uncertainties, but additionally grew to become a famend centre of the Roaring Twenties. The metropolis experienced its heyday as a major world capital and was recognized for its leadership roles in science, technology, arts, the humanities, city planning, movie, higher training, government and industries.At the end of the First World War in 1918, a republic was proclaimed by Philipp Scheidemann on the Reichstag building. In 1920, the Greater Berlin Act incorporated dozens of suburban cities, villages and estates round Berlin into an expanded city. The population nearly doubled and Berlin had a inhabitants of around 4 million.Albert Einstein rose to public prominence during his years in Berlin, being awarded the Nobel Prize for Physics in 1921. Berlin lies in northeastern Germany, east of the River Elbe, that after constituted, along with the River Saale , the eastern border of the Frankish Realm. While the Frankish Realm was primarily inhabited by Germanic tribes just like the Franks and the Saxons, the regions east of the border rivers had been inhabited by Slavic tribes. This is why many of the cities and villages in northeastern Germany bear Slavic-derived names .