Answer:
The Great War, or World War I, was caused by a number of factors, including political, economic, and social tensions between countries in Europe, nationalist tensions, and a breakdown of diplomacy in the early 20th century. Political tensions between the European powers of the Triple Alliance (Germany, Austria-Hungary, and Italy) and the Triple Entente (Britain, France, and Russia) had been growing for some time, as both sides sought to increase their power and influence in Europe. Economic tensions between countries in Europe also contributed to the start of the war, as countries sought to protect their own economic interests. Social tensions, such as the long-standing conflict between the Slavic and Austro-Hungarian empires, were also a contributing factor. Finally, the breakdown of diplomacy in Europe was a major factor that led to the war, as European leaders failed to resolve their differences through diplomatic negotiations..