Causes of World War I

Events leading to World War I
Unification of Germany 1866–1871 Franco-Prussian War 1870–1871 Second Concert of Europe 1871 Great Eastern Crisis 1875–1878 Campaign in Bosnia 1878 Dual Alliance 1879 Boer Wars 1880–1902 Austro–Serbian Alliance 1881–1903 Triple Alliance 1882 Berlin Conference 1884 Bulgarian Crisis 1885–1888 Reinsurance Treaty 1887–1890 Franco-Russian Alliance 1894 Anglo-German naval arms race 1898–1912 Fashoda incident 1898 Anglo-Japanese Alliance 1902 Russo-Japanese War 1904–1905 Entente Cordiale 1904 First Moroccan Crisis 1905–1906 Pig War 1906–1908 Anglo-Russian Convention 1907 Young Turk Revolution 1908 Bosnian Crisis 1908–1909 Racconigi Bargain 1909 Second Moroccan Crisis 1911 Italo-Turkish War 1911–1912 Balkan Wars 1912–1913 Assassination of Franz Ferdinand 1914 July Crisis 1914
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The identification of the causes of World War I remains a debated issue. World War I began in the Balkans on July 28, 1914, and hostilities ended on November 11, 1918, leaving 17 million dead and 25 million wounded. Moreover, the Russian Civil War can in many ways be considered a continuation of World War I, as can various other conflicts in the direct aftermath of 1918.

Scholars looking at the long term seek to explain why two rival sets of powers (the German Empire, Austria-Hungary, and the Ottoman Empire against the Russian Empire, France, and the British Empire) came into conflict by the start of 1914. They look at such factors as political, territorial and economic competition; militarism, a complex web of alliances and alignments; imperialism, the growth of nationalism; and the power vacuum created by the decline of the Ottoman Empire. Other important long-term or structural factors that are often studied include unresolved territorial disputes, the perceived breakdown of the European balance of power,^[1][2] convoluted and fragmented governance, arms races and security dilemmas,^[3][4] a cult of the offensive,^[1][5][4] and military planning.^[6]

Scholars seeking short-term analysis focus on the summer of 1914 and ask whether the conflict could have been stopped, or instead whether deeper causes made it inevitable. Among the immediate causes were the decisions made by statesmen and generals during the July Crisis, which was triggered by the assassination of Archduke Franz Ferdinand of Austria by the Bosnian Serb nationalist Gavrilo Princip, who had been supported by a nationalist organization in Serbia.^[7] The crisis escalated as the conflict between Austria-Hungary and Serbia was joined by their allies Russia, Germany, France, and ultimately Belgium and the United Kingdom. Other factors that came into play during the diplomatic crisis leading up to the war included misperceptions of intent (such as the German belief that Britain would remain neutral), the fatalistic belief that war was inevitable, and the speed with which the crisis escalated, partly due to delays and misunderstandings in diplomatic communications.

The crisis followed a series of diplomatic clashes among the Great Powers (Italy, France, Germany, United Kingdom, Austria-Hungary and Russia) over European and colonial issues in the decades before 1914 that had left tensions high. And the cause of the public clashes can be traced to changes in the balance of power in Europe that had been taking place since 1867.^[8]

Consensus on the origins of the war remains elusive, since historians disagree on key factors and place differing emphasis on a variety of factors. That is compounded by historical arguments changing over time, particularly as classified historical archives become available, and as perspectives and ideologies of historians have changed. The deepest division among historians is between those who see Germany and Austria-Hungary as having driven events and those who focus on power dynamics among a wider set of actors and circumstances. Secondary fault lines exist between those who believe that Germany deliberately planned a European war, those who believe that the war was largely unplanned but was still caused principally by Germany and Austria-Hungary taking risks, and those who believe that some or all of the other powers (Russia, France, Serbia, United Kingdom) played a more significant role in causing the war than has been traditionally suggested.