List of former national capitals

Columns: Old capital city | Country | Today a part of | From | Until | Change , reason
Munich | Bavaria , Kingdom of | Germany | 14th century | 1918 | Bavaria became part of the German Empire in 1871 , and lost sovereignty fully in 1918 . Munich remains the capital of the German state of Bavaria | Braunschweig ( Brunswick ) | Brunswick , Duchy of | Germany | 1815 | 1918 | Brunswick became part of the German Empire in 1871 , and lost sovereignty fully in 1918 . Braunschweig remained the capital of the German Free State of Brunswick until 1946 when it became part of the German state of Lower Saxony | Frankfurt | Rhine , Confederation of the | Germany | 1806 | 1815 | Confederation dissolved | Frankfurt | German Confederation | Germany | 1815 | 1866 | German Confederation dissolved | Berlin | German Empire | Germany | 1871 | 1918 | Berlin | Germany ( Weimar Republic ) | Germany | 1919 | 1933 | Berlin | Germany ( Nazi Germany ) | Germany | 1933 | 1945 | Separation of Germany into occupation zones for the Allied powers

Example questions:
What is the population of the city that was once the national capital of the Confederation of the Rhine from 1806 to 1815 ? | A border city that was former national capital in North Rine-Westphalia was in an empire that went over which mountain range ? | What pejorative connotation does the city that was the former national capital of France from 1940 to 1944 hold ? | Which mountains does the city that was a former national capital of Duchy of Brunswick from 1815 to 1918 lie north of ?

Answers:
2.3 million | Pyrenees | collaboration | Harz mountains