- Between the establishment of the GDR in **October 1949** and August 1961, approximately **2.6 million East Germans** left for the West through Berlin.
- This represented roughly **one-sixth of the GDR's population**.
- Many refugees were young, skilled or professionally trained workers.
- By 1960, the GDR estimated that it was losing approximately **230,000 trained people per year**.
- East Germany's leader, **Walter Ulbricht**, sought to stop the population loss by closing the border between East and West Berlin.
- On **15 June 1961**, Ulbricht publicly stated that no one intended to build a wall, despite the growing pressure to seal the border.