Germany has an area of 891 square km and a population of 3.4 million people. After World War 2, Germany was divided into four occupied zones controlled by the UK, USSR, USA, and France. When the war ended, Berlin was also divided among the four powers, with East Berlin controlled by the USSR and West Berlin divided among the French, British, and American sectors. The construction of the Berlin Wall in 1961 separated East and West Berlin until it was torn down in 1989, reunifying the city.