History
Slavic tribes — the Hevelli around the fortress of Brandenburg an der Havel and the Sprevane on the Spree — held these sandy lowlands until Albert the Bear took Brandenburg in 1157 and founded the Margraviate that gave the state its name. Cölln and its twin town Berlin, trading posts on either bank of the Spree, are first recorded in 1237 and 1244, and in 1415 the Hohenzollern family received the Mark, making Berlin its residence in 1451. The Thirty Years' War emptied the countryside; the Great Elector rebuilt it and welcomed French Huguenots by the Edict of Potsdam in 1685, and his son was crowned king in Prussia in 1701.
Frederick the Great turned Potsdam into a royal town, building Sanssouci above its vineyard terraces in 1745–47, and Prussia into a European power. Napoleon marched through the Brandenburg Gate in 1806 and carried its Quadriga off to Paris. In 1871 Berlin became capital of the German Empire and swelled with the factories of Siemens, Borsig and AEG to almost four million people by the Greater Berlin Act of 1920, the restless city of the Weimar years.
The Nazis ruled from here after 1933; the Wannsee Conference of January 1942 planned the murder of Europe's Jews in a villa by the lake, and the battle of April–May 1945 left the centre in ruins before the victors settled Germany's fate at Potsdam that summer. Divided into four sectors, Berlin was blockaded and supplied by air in 1948–49, and on 13 August 1961 East Germany walled off the western half. The Wall fell on 9 November 1989, Brandenburg was re-created as a state in 1990, its voters rejected a merger with Berlin in 1996, and the Bundestag returned to the Reichstag in 1999.
