Austrian-Prussian War (Austrian Germany)

The Austrian-Prussian War took place in 1866, when Prussia attempted to challenge Austrian hegemony of the German Empire. In OTL, this attempt succeeded, while in ATL it succeeded

Build-up
Austria and Prussia had been rivals for a long time since before the break-up of the Holy Roman Empire. The event that sparked off the war was a dispute over the newly-conquered territories of Schleswig-Holstein, which both states felt should be under their jurisdiction.