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World War I
Also known as the First World War, the Great War and the War To End All Wars, was a global military conflict which took place primarily in Europe from 1914 to 1918. Over 40 million casualties resulted, including approximately 20 million military and civilian deaths. Over 60 million European soldiers were mobilized from 1914 to 1918. The immediate cause of the war was the June 28, 1914 assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, by Gavrilo Princip, a Bosnian Serb citizen of Austria-Hungary and member of the Black Hand. The retaliation by Austria-Hungary against Serbia activated a series of alliances that set off a chain reaction of war declarations. Within a month, much of Europe was in a state of open warfare.

The war was propagated by two major alliances. The Entente Powers initially consisted of France, the United Kingdom, Russia and their associated empires and dependencies. Numerous other states joined these allies, most notably Italy in April 1915, and the United States in April 1917. The Central Powers, so named because of their central location on the European continent, initially consisted of Germany and Austria-Hungary and their associated empires. The Ottoman Empire joined the Central Powers in October 1914, followed a year later by Bulgaria. By the conclusion of the war, only The Netherlands, Switzerland, Spain and the Scandinavian nations remained officially neutral among the European countries, though many of those provided financial and material support to one side or the other.

The fighting of the war mostly took place along several fronts that broadly encircled the European continent. The Western Front was marked by a system of trenches, breastworks, and fortifications separated by an area known as no man's land.  These fortifications stretched 475 miles (more than 600 kilometres) and precipitated a style of fighting known as trench warfare. On the Eastern Front, the vast eastern plains and limited rail network prevented a trench warfare stalemate, though the scale of the conflict was just as large as on the Western Front. The Middle Eastern Front and the Italian Front also saw heavy fighting, while hostilities also occurred at sea, and for the first time, in the air.

The war was ended by several treaties, most notably the Treaty of Versailles, signed on June 28, 1919, though the Allied powers had an armistice with Germany in place since November 11, 1918. One of the most striking results of the war was a large redrawing of the map of Europe. All of the Central Powers lost territory, and many new nations were created. The German Empire lost its colonial possessions and was saddled with accepting blame for the war, as well as paying punitive reparations for it. The Austro-Hungarian and Ottoman empires were completely dissolved. Austria-Hungary was carved up into several successor states including Austria, Hungary, Czechoslovakia, and Yugoslavia. The Ottoman Empire disintegrated, and much of its non-Anatolian territory was awarded as protectorates of various Allied powers, while the remaining Turkish core was reorganized as the Republic of Turkey. The Russian Empire, which had withdrawn from the war in 1917, lost much of its western frontier as the newly independent nations of Estonia, Finland, Latvia, Lithuania, and Poland were carved from it. After the war, the League of Nations was created as an international organization designed to avoid future wars by giving nations a means of solving their differences diplomatically. World War I marked the end of the world order which had existed after the Napoleonic Wars, and was an important factor in the outbreak of World War II.

Causes
A graphic depiction of the state of international relations in pre-WWI Europe. Italy joined the Triple Entente in April 1915.On 28 June 1914, Gavrilo Princip, a Bosnian Serb student, shot and killed Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, in Sarajevo. Princip was a member of Young Bosnia, a group whose aims included the unification of the South Slavs and independence from Austria-Hungary. The assassination in Sarajevo set into motion a series of fast-moving events that eventually escalated into full-scale war. Austria-Hungary demanded action by Serbia to punish those responsible and, when Austria-Hungary deemed Serbia had not complied, declared war. Major European powers were at war within weeks because of overlapping agreements for collective defense and the complex nature of international alliances.

Arms race
The naval race between Britain and Germany was intensified by the 1906 launch of HMS Dreadnought —a revolutionary craft whose size and power rendered previous battleships obsolete. Britain also maintained a large naval lead in other areas particularly over Germany and Italy. Paul Kennedy pointed out both nations believed Alfred Thayer Mahan's thesis of command of the sea as vital to great nation status; experience with guerre de course would prove Mahan wrong.

David Stevenson described the arms race as "a self-reinforcing cycle of heightened military preparedness."  David Herrmann viewed the shipbuilding rivalry as part of a general movement in the direction of war. The revisionist Niall Ferguson, however, argued Britain's ability to maintain an overall lead signified this was not a factor in the oncoming conflict.

The cost of the arms race was felt in both Britain and Germany. The total arms spending by the six Great Powers (Britain, Germany, France, Russia, Austria-Hungary and Italy) increased by 50% between 1908 and 1913.

Plans, distrust, and mobilization
Closely related is the thesis adopted by many political scientists that the mobilization plans of Germany, France and Russia automatically escalated the conflict. Fritz Fischer emphasized the inherently aggressive nature of the Schlieffen Plan, which outlined a two-front strategy. Fighting on two fronts meant Germany had to eliminate one opponent quickly before taking on the other. It called for a strong right flank attack, to seize Belgium and cripple the French army by pre-empting its mobilization. After the attack, the German army would rush east by railroad and quickly destroy the slowly mobilizing Russian forces.

France's Plan XVII envisioned a quick thrust into the Ruhr Valley, Germany’s industrial heartland, which would in theory cripple Germany's ability to wage a modern war.

Russia's Plan XIX foresaw a mobilization of its armies against both Austria-Hungary and Germany.

All three plans created an atmosphere in which speed was one of the determining factors for victory. Elaborate timetables were prepared; once mobilization had begun, there was little possibility of turning back. Diplomatic delays and poor communications exacerbated the problems.

Also, the plans of France, Germany and Russia were all biased toward the offensive, in clear conflict with the improvements of defensive firepower and entrenchment.

Militarism and autocracy
President Woodrow Wilson of the United States and others blamed the war on militarism. Some argued that aristocrats and military élites had too much power in countries such as Germany, Russia, and Austria-Hungary. War was thus a consequence of their desire for military power and disdain for democracy. This theme figured prominently in anti-German propaganda. Consequently, supporters of this theory called for the abdication of rulers such as Kaiser Wilhelm II, as well as an end to aristocracy and militarism in general. This platform provided some justification for the American entry into the war when the Russian Empire surrendered in 1917.

The Allies consisted of Great Britain and France, both democracies, fighting the Central Powers, which included Germany, Austro-Hungary, and the Ottoman Empire. Russia, one of the Allied Powers, was an empire until 1917, but it was opposed to the subjugation of Slavic peoples by Austro-Hungary. Against this backdrop, the view of the war as one of democracy versus dictatorship initially had some validity, but lost credibility as the conflict dragged on.

Wilson hoped the League of Nations and disarmament would secure a lasting peace. He also acknowledged that variations of militarism, in his opinion, existed within the British and French Empires.

Balance of power
Political cartoon depicting the tangled web of European alliances.One of the goals of the foreign policies of the Great Powers in the pre-war years was to maintain the 'Balance of Power' in Europe. This evolved into an elaborate network of secret and public alliances and agreements. For example, after the Franco-Prussian War (1870–71), Britain seemed to favor a strong Germany, as it helped to balance its traditional enemy, France. After Germany began its naval construction plans to rival that of Britain, this stance shifted. France, looking for an ally to balance the threat created by Germany, found it in Russia. Austria-Hungary, facing a threat from Russia, sought support from Germany.

When World War I broke out, these treaties only partially determined who entered the war on which side. Britain had no treaties with France or Russia, but entered the war on their side. Italy had a treaty with both Austria-Hungary and Germany, yet did not enter the war with them; Italy later sided with the Allies. Perhaps the most significant treaty of all was the initially defensive pact between Germany and Austria-Hungary, which Germany in 1909 extended by declaring that Germany was bound to stand with Austria-Hungary even if it had started the war.

Economic imperialism
Vladimir Lenin asserted that imperialism was responsible for the war. He drew upon the economic theories of Karl Marx and English economist John A. Hobson, who predicted that unlimited competition for expanding markets would lead to a global conflict. This argument was popular in the wake of the war and assisted in the rise of Communism. Lenin argued that the banking interests of various capitalist-imperialist powers orchestrated the war.

Trade barriers
Cordell Hull, American Secretary of State under Franklin Roosevelt, believed that trade barriers were the root cause of both World War I and World War II. In 1944, he helped design the Bretton Woods Agreements to reduce trade barriers and eliminate what he saw as the cause of the conflicts.

Ethnic and political rivalries
A Balkan war between Austria-Hungary and Serbia was considered inevitable, as Austria-Hungary’s influence waned and the Pan-Slavic movement grew. The rise of ethnic nationalism coincided with the growth of Serbia, where anti-Austrian sentiment was perhaps most fervent. Austria-Hungary had occupied the former Ottoman province of Bosnia-Herzegovina, which had a large Serb population, in 1878. It was formally annexed by Austria-Hungary in 1908. Increasing nationalist sentiment also coincided with the decline of the Ottoman Empire. Russia supported the Pan-Slavic movement, motivated by ethnic and religious loyalties and a rivalry with Austria dating back to the Crimean War. Recent events such as the failed Russian-Austrian treaty and a century-old dream of a warm water port also motivated St. Petersburg.
Myriad other geopolitical motivations existed elsewhere as well, for example France's loss of Alsace and Lorraine in the Franco-Prussian War helped create a sentiment of irredentist revanchism in that country. France eventually allied itself with Russia, creating the likelihood of a two-front war for Germany.