The Seven Years War may has the distinction of having occured in multiple theatres of wars. It was fought on all the known continents, the British, Prussians and Austrians fought the French and Spanish in Europe, while the British and French fought each other in North America, India and the Caribbean. Britain also fought the Spanish in the Caribbean and in the Philippines when the East India Company took Manila, as well as the obvious privateering in places as distant as the Indian Oceanin and the China Sea, as well as the Pacific. Look at the countless numbers of countries involved, as well as the size of armies involved outside Europe, and the scale of the changes of borders and campaigns all make the 7 years war a "world war"