Throughout history, we have put efforts to live in peace and harmony with each other. Although we inhabit the whole planet across all 7 continents, we somehow found ways to have mutual interaction through trading and migration. More powerful nations slowly expanded their empire and degree of influence to neighboring countries or to unchartered territories. Once in a while, conflicts among nations erupt. To date, two costly world wars have occurred in the 20th century: World War I and World War II. Why do world wars occur in the first place?
According to Wikipedia, a world war is “…a war affecting most of the world’s most powerful and populous countries.” When multiple countries on multiple continents are involved, world war occurs. In the Second World War, battles were fought in multiple theaters, such as the European Theater and Pacific Asian Theatre.
Before the outbreak of World War I in 1914, there were many large scale wars that involved several countries spanning multiple continents. For instance, Ramesses II, the Egyptian pharaoh who reigned in 1279-1213 BC, embarked on many battles to reclaim territories held by the Nubians and Hittites as well as to secure the borders of Egypt against external attacks.
WWI began in July 28, 1914 until November 11, 1918. Battles were fought in Europe, Africa, the Middle East, the Pacific Islands, China, and off the coast of South and North America. The United States, United Kingdom, Russia, and France fought the European Central Powers of Germany, Austrian-Hungary, and the Ottoman Empire.
War was seemingly imminent as conflicts and hostilities between the great European powers were building up for decades leading up to the war. On June 28, 1914, Archduke Franz Ferdinand of Austria, heir to the throne of Austria-Hungary, and his wife Sophie were assassinated in Sarajevo by Gavrilo Princip, a Yugoslav nationalist. The assassination became the trigger for World War I as the major powers were at war within weeks and the conflict later on spread around the world.
World War II erupted in September 1, 1939 and culminated in September 2, 1945. Battles were fought in Europe, Pacific, Atlantic, South-East Asia, China, Middle East, Mediterranean, Africa, and briefly in North and South America. The Second World War went off in Europe because the Allied Powers of the USA, Soviet Union, UK, and France (with the cooperation of other countries) didn’t want Adolf Hitler and Nazi Germany to inhumanly dominate Europe. In Asia, Allied forces waged war with Japan as it started its own plans of ruling East Asia. Fears of a Third World War came about when the USA had a tense Cold War with the Soviet Union in the late 1940s until the early 1990s.
Generally speaking, world wars happen when good forces try to prevent bad forces from doing much worse or someone hack facebook. To get more information about world wars, view client history. There are many sites that deal with world war history. You might even get to read some dentist reviews during WWII.