Brandenburg the Province of Brandenburg, again subdivided into the government regions of Frankfurt and Potsdam. In 1881, the City of Berlin was separated from the Province of Brandenburg. However, industrial towns ringing Berlin lay within Brandenburg, and the growth of the region's industrial economy brought an increase in the population of the province. The Province of Brandenburg had an area of and a population of 2.6 million (1925). After World War II, the Neumark, the part of Brandenburg east of the Oder–Neisse line, was transferred to Poland; and its native German population expelled. The remainder of the province became a state
Brandenburg Gate (Potsdam) two completely different sides, designed by two architects. Carl von Gontard designed the city side, his pupil, Georg Christian Unger, the field or countryside-facing side. Gontard made the city side as a rendered facade with Corinthian-style lesenes and trophies, Unger designed the field site in the style of the Arch of Constantine with Corinthian double-columns and ornamentation like the golden trumpets. The two side entrances for pedestrians were not added until 1843, under Frederick William IV, in order to cope with the increase in pedestrian traffic. At that time people had to pass the Brandenburg Gate if they wanted to