War of Austrian Succession had Prussia seizing a rich German Province called Silesia which always pissed off Austria. A series of Alliances was put in place mostly between the French, Austrians, and Russians on one side and the British and Prussians on the other.
French started laying claims in what is now Pennsylvania, near Pittsburgh. Washington was sent out to contest those claims, he killed a French patrol, then ran away to dig in by building Fort Necessity. French attacked, got him to surrender, and sign a confession. Brits were pissed and started capturing French merchant ships. French invaded Minorca in retaliation. The Prussians realized shit was about to kick off and preemptively attacked Austria. War was fought from Europe to North America, the Caribbean, the Philippines, and India.