1756 - The Seven Years' War begins when England declares war on France.
The Seven Years' War (1756–1763), some of whose theatres are called the Pomeranian War and the French and Indian War, was hailed by Winston Churchill as the first world war, as it was the first conflict in human history to be fought around the globe.
The war involved all major powers of Europe: Prussia, Great Britain (with British Colonies in North America), and Hanover were pitted against Austria, France (with New France), Russia, Sweden, and Saxony. Spain and Portugal were later drawn into the conflict, while a force from the neutral United Provinces of the Netherlands was attacked in India. The most tangible outcome of the war was the end of France’s power in the Americas (having only four islands left to them) and the emergence of Great Britain as the most powerful colonial power in the world.