Which German city was divided into four sectors after World War II?

After World War II, the former capital was divided into four sectors controlled by the USA, the UK, France, and the Soviet Union. This division led to events like the Airlift and later the construction of the Wall.

• Look for keywords such as four-power occupation, sectors, Airlift, or Wall. Recall that only one major German city was jointly administered by all four Allies. Eliminate cities that were entirely in one occupation zone (e.g., strictly US or Soviet) or smaller border towns not historically linked to four-sector administration.