Berlin is a result of a union between two founding towns, Colln and Berlin. They affiliated themselves in 1307 for a union. After riots, elector Friedrich II declared Colln/Berlin his residence in 1451.
The city was devastated in 1945 after the Nazi terror and the end of World War II. Berlin was then divided into four parts: the East was administered by the Soviet Union, the Southwest by the USA, the West by Great Britain and the Northwest by France. As a result of the Berlin Blockade in 1948, Berlin became an object of the Soviet-American conflict as the Americans and British supplied the three West Sectors via "Air Lift" with aircrafts they nick-named "Candy Bombers". Reconstruction began in both East and West Berlin but not without a price. August 13, 1961 is remembered as the day of division, when the Berlin Wall separated this cities people.
Twenty-eight years later, celebration broke out in the city as the Berlin Wall was torn down on November 9, 1989. Months later in 1990, Berlin was reunified and became the residence of the Federal Government, which held its first plenary session on April 19, 1999 in the redesigned Reichstag. Because the Reichstag has a new glass dome, it has become an attraction for both Berliners and tourists from all over the world. Berlin celebrated the new millennium with a magnificent party at the Brandenburger Tor. Berlin has changed a lot since then and will continue to change.