Europe avoided major wars in the 100 years before World War 1 began. In the 1800 's, an idea swept across the continent that helped bring about the Great War. Many historians argue that there are many causes of the first World War some of which are not disclosed to the wider population. However, the main causes of World War I, which began in central Europe in late July 1914, included many factors, such as the conflicts and hostility between the great European powers of the four decades leading up to the war. Militarism, alliances, imperialism, and nationalism played major roles in the conflict as well. The immediate origins of the war, however, lay in the decisions taken by statesmen and generals during the July Crisis of 1914 caused by the assassination of Archduke Franz Ferdinand and his wife Sophie by Gavrilo Princip, anirredentist Serb and member of the Serbian nationalist organization, the Black Hand.
The crisis came after a long and difficult series of diplomatic clashes between the Great Powers (Italy, France, Germany, Britain, Austria-Hungary and Russia) over European and colonial issues in the decade before 1914 that had left tensions high. In turn these diplomatic clashes can be traced to changes in the balance of power in Europe since 1867. The more immediate cause for the war was tensions over territory in the Balkans. Austria-Hungary competed with Serbia and Russia for territory and influence in the region and they pulled the rest of the Great Powers into the conflict through their various alliances and treaties.
According to Henig (2002), another cause of the first World War was the Franco-Prussian War. The war between France and Prussia (the future German Empire) that lasted from 1870 to 1871 ended with a humiliating defeat for France. It lost the regions of Alsace and Lorraine, and was forced to pay a huge indemnity to Prussia. The Franco-Prussian War led to creation of a powerful German
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