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.
Seven Years' War
The Seven Years' War was a global conflict fought between 1756 and 1763. It involved every European great power of the time and spanned five continents, affecting Europe, the Americas, West Africa, India, and the Philippines. The conflict split Europe into two coalitions, led by the Kingdom of Great Britain (including the Kingdom of Prussia, the Kingdom of Portugal, the Electorate of Brunswick-Lüneburg, and other small German states) on one side and the Kingdom of France (including the Austrian-led Holy Roman Empire), the Russian Empire (until 1762), the Kingdom of Spain, and the Swedish Empire on the other. Meanwhile, in India, some regional polities within the increasingly fragmented Mughal Empire, with the support of the French, tried to crush a British attempt to conquer Bengal. The war's extent has led some historians to describe it as "World War Zero", similar in scale to other world wars.