April 1949, the French began to merge their zone into Bizonia, which became Trizonia.
May 1949, Trizonia became the Federal Republic of Germany (FRG) with Bonn as the provisional capital.
October 1949, the Soviet zones (Germany and Berlin) become the German Democratic Republic (GDR) with Berlin as the capital.
West Germany (FRG) and East Germany (GDR) with their respective captials (Bonn & Berlin)
The border between Trizonia and the Soviet sector became an international border but was comparatively easy to cross.
Since the end of the war in 1945 there had been a constant flow of population from east to west. Between October 1945 and June 1946, 1.6 million Germans left the Soviet zone.
With the foundation of the FRG (West Germany) and GDR (East Germany) this movement continued and, despite the increase in East German security measures, 675,000 people fled to West Germany between 1949 and 1952.