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A world war is a military conflict affecting the majority of the world's countries. World wars usually span multiple continents, and are very bloody and destructive.

The term is usually used to refer to World War 1 ( 1914– 1918) and World War II ( 1939– 1945). Both wars involved some degree of participation from most of the world's existing countries, specially through the colonial empires of Great Britain, France, Germany, Italy and Japan, besides the United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in and the Soviet UnionThe Union of Soviet Socialist Republics (USSR ( Russian: ; tr. Soyuz Sovetskikh Sotsialisticheskikh Respublik (SSSR) also called the Soviet Union ( ; tr. Sovetsky Soyuz , was a state in much of the northern region of Eurasia that existed from 1922 until 1.

Other wars in earlier periods that saw conflict across the world have been considered world wars by some, including the Seven Years' WarThis article is about the 1756 1763 war. For the 1592 1598 war in Korea, see Seven Year War. The Seven Years' War ( 1756 1763) pitted Great Britain, Prussia and Hanover against France, Austria, Russia, Sweden, and Saxony. It was the first " world war"; mo ( 1756Events March 17 St. Patrick's Day is celebrated in New York City for the first time (at the Crown and Thistle Tavern). May 15 Seven Years' War: The war begins when England declares war on France. August 29 Frederick the Great attacks Saxony October 1 Seve– 1763Events February 10 French and Indian War: The 1763 Treaty of Paris ends the war and France cedes Canada to Great Britain. 15 February the Treaty of Hubertusburg puts an end to the Seven Years' War between Prussia and Austria and their allies March 1 Charl; Winston ChurchillChurchill" redirects here. For other meanings, see Churchill (disambiguation). The Right Honourable Sir Winston Leonard Spencer-Churchill KG, OM, CH, FRS ( November 30, 1874 January 24, 1965) was a British politician, best known as Prime Minister of the U called it "the first world war" in his A History of the English Speaking PeoplesA History of the English Speaking Peoples is a four-volume history of Britain and the English speaking nations, written by Winston Churchill, covering the period from the Norman Conquest of Britain ( 1066) to the beginning of World War I ( 1914). Churchil), the French Revolutionary WarsThe French Revolutionary Wars occurred between the outbreak of war between the French Revolutionary government and Austria in 1792 and the Treaty of Amiens in 1802. It is usually divided between the First Coalition (1792- 1797) and the Second Coalition ( ( 1792– 1802) and the Napoleonic Wars ( 1803– 1815).

There is some disagreement on whether there have been any world wars since 1945. " World War III" was widely used to refer to a hypothetical nuclear war between the Soviet Union, the United States and their allies. " World War III" has also been used to refer to the Cold War ( 1945– 1990) and to the War on Terrorism. " World War IV" was used by Professor Eliot Cohen to refer to the War on Terrorism. However, these designations are not widely used.

Since the conclusion of World War 1, called "the war to end all wars," international organizations have been developed to attempt to prevent the outbreak of new wars. The League of Nations was established after World War I, and collapsed with the outbreak of World War II, after which the United Nations was formed.