A look at how Germany voted on a map of Germany gives a better idea of what really happened in the 2021 election. The narrow margin of about 2% of Social Democrats over Christian Democrats looks different from the map. The CDU black color region is mostly all of southern Germany, the region includes Bavaria with its capital Munich. And parts of West Germany around Cologne.
In Cologne and Berlin the Greens dominated.
The rest of Germany is all Social Democrats red. Only in parts of the east in Saxony and Thuringia one finds AfD far right.
Geographically SPD red is all over Germany except for the southern region of Bavaria. A seat Merkel held for 30 years went to the Social Democrats SPD party,