What was the cause of the liberation of belgium?

The liberation of Belgium during World War II was primarily caused by the Allied invasion of Western Europe, particularly the D-Day landings in June 1944. Following the successful campaign in Normandy, Allied forces advanced through France and into Belgium, driving back German troops. The Belgian resistance, combined with the efforts of the Allies, played a crucial role in the liberation process. By September 1944, major cities, including Brussels and Antwerp, were freed from German occupation.