Seven Years' War

1756–1763 Global Status: ended Casualties: ~1.4 million

Often called the first 'world war' — fought in Europe, North America, India, the Caribbean, and West Africa. Britain emerged as the dominant colonial power, gaining Canada and India. Redrew the global balance of power.

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Belligerents

Britain (Prussia allied)
France (Austria, Russia, Spain allied)

Casualties

~1.4 million

From World at War, an interactive atlas by Jairus Pereira. Figures are approximate, drawn from Wikipedia, UCDP, ACLED and academic sources — a design artefact, not an authoritative register. Contact.