Austro-Italian ironclad arms race
Austria's defeat in the Seven Weeks War forced Austria to determine a new set of foreign and domestic policies for the future, as Austria's interests since the days of the Holy Roman Empire had primarily been found in Italy and Germany. The Empire thus reformed itself into the Austria-Hungarian Empire following the adoption of the Austro-Hungarian Compromise of 1867 (German: "Ausgleich"), which re-established the sovereignty of the Kingdom of Hungary and placed Hungarians within the Empire on an equal footing with Austrians. Under the "Ausgleich", Emperor Franz Joseph I would be crowned as King of Hungary, while a separate parliament at Pest with powers to enact laws for the lands of the Holy Crown of Hungary would be established.
1757 raid on Berlin
After the War of the Austrian Succession, traditional European alliances fell apart and were replaced by an Anglo-Prussian pact and a Franco-Austrian alliance. Known as the Diplomatic Revolution, these events caused the Seven Years' War. Frederick II, King of Prussia and bitter rival of the Holy Roman Empress Maria Theresa of Austria, invaded Silesia in 1756 but suffered his first defeat at Kolin on June 18. In the aftermath of the battle, however, Frederick neglected to protect the approach to his capital, Berlin.