Repercussions

The Peace of Paris gave Britain the largest territorial gain in its history: all of French Canada, Florida (from Spain), several Caribbean islands, dominance over India, and West African trading posts. Britain emerged as the undisputed world power — controlling more of the globe's surface and sea lanes than any nation in history to that point.

Frederick the Great entered the war as the king of a medium-sized north German state. He emerged as one of the dominant figures of European politics. Prussia's survival against Austria, France, and Russia demonstrated that it was a first-rank power. The stage was set for Prussia's eventual leadership of German unification a century later.

France spent approximately 1.3 billion livres on the Seven Years' War — money it did not have — and won nothing. The resulting national debt, compounded by French participation in the American Revolution (to avenge the humiliation of 1763), broke the French financial system and was the proximate cause of the Revolution of 1789.

The Seven Years' War created the conditions for American independence in two ways: it eliminated the French threat that made colonists depend on British military protection, and it generated the debt that caused Britain to tax the colonies, triggering the 'no taxation without representation' crisis. The French & Indian War was the American theater of this global conflict.

Plassey enabled the East India Company to install a favorable nawab and increase its influence in Bengal. Company territorial and revenue power was consolidated through later conflicts and the 1765 diwani grant; British rule over most of the subcontinent emerged over many decades rather than beginning fully formed in a single mango grove.

Frederick's oblique order, his use of horse artillery, and the Prussian army's combination of drill and operational speed became the model for military reform across Europe. Every major army spent the 1760s-1780s studying and imitating Prussian methods. The reforms they adopted created the armies that would fight the Napoleonic Wars — and, ultimately, the German military tradition that shaped the 20th century.

Pitt's strategy of using naval supremacy to blockade France, protect colonies, and project power worldwide became the template for British grand strategy for the next 150 years. Quiberon Bay and the overall naval campaign proved that control of the seas was worth more than any continental alliance. The Royal Navy's dominance, established in this war, lasted until World War I.

The humiliation of the Seven Years' War drove French foreign policy for a generation. When Britain's American colonies rebelled in 1775, France seized the opportunity for revenge, allying with the rebels and providing the military and naval support that made American independence possible. France got its revenge — and immediately went bankrupt doing it, accelerating its own revolution.