How did the Austro-Prussian War of 1866 change Austria’s role in the German states?

The Austro-Prussian War of 1866, also known as the Seven Weeks’ War, fundamentally altered Austria’s role in the German states by ending its long-standing hegemony and excluding it from German affairs.123

Key consequences of the war included:

• End of the German Confederation: The war resulted in the dissolution of the German Confederation, the organization through which Austria had previously exerted its influence over the German states.12
• Prussian Dominance: With Austria defeated at the Battle of Königgrätz, Prussia became the sole power in Germany. Prussia subsequently established the North German Confederation under its own leadership, effectively sidelining Austrian political influence.234
• Shift in Focus: As Austria had been excluded from the future of Italy in 1859, the 1866 defeat similarly excluded it from the future of Germany. This forced the Habsburg monarchy to turn its attention inward, leading to the Ausgleich (Compromise) of 1867, which reorganized the empire into the Dual Monarchy of Austria-Hungary.15

Ultimately, the contest between Vienna and Berlin that had defined the history of the German states for over a century was brought to a definitive close.2