Britannica Sources used in this answer

Which territories did Prussia annex after defeating Austria in 1866?

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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.

Following its victory in the Seven Weeks’ War against Austria and its allies in 1866, Prussia annexed several territories outright. These included:

Schleswig-Holstein
Hanover
Hesse-Kassel
Nassau
Frankfurt

These annexations were significant because they consolidated Prussian power and connected the previously separated eastern and western portions of the Prussian state.12