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Which German states supported Austria in the Seven Weeks’ War?

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Otto von Bismarck in military uniform and cap, with a mustache, facing slightly to the side in a black-and-white portrait taken around 1880. — Otto von Bismarck Otto von Bismarck.

In the Seven Weeks’ War of 1866, several German states aligned with Austria against Prussia. These states primarily viewed Austria as the defender of their independence against Prussian ambitions.1

The German states that supported Austria included:

Bavaria2
Saxony2
Hanover2
Various other minor German states2

Most of these secondary states aligned with the Habsburg empire, but they were ultimately defeated by the Prussian army. Following the Prussian victory, several of these states—specifically Hanover, Hesse-Kassel, Nassau, and Frankfurt—were annexed outright by Prussia.21