WORLD WAR I

world war I (WWI or WW1), also known as the First World War, was a global war centered in Europe that began on 28 July 1914 and lasted until 11 November 1918. From the time of its occurrence until the approach of World War II in 1939, it was called simply the World War or the Great War, and thereafter the First World War or World War I.[5][6][7] In America it was initially called the European War.[8] More than 9 million combatants were killed: a scale of death impacted by industrial advancements, geographic stalemate and reliance on human wave attacks. It was the fifth-deadliest conflict in world history, paving the way for major political changes, including revolutions in many of the nations involved.[9]
The war drew in all the world's economic great powers,[10] which were assembled in two opposing alliances: the Allies (based on the Triple Entente of the United Kingdom, France and the Russian Empire) and the Central Powers of Germany and Austria-Hungary. Although Italy had also been a member of the Triple Alliance alongside Germany and Austria-Hungary, it did not join the Central Powers, as Austria-Hungary had taken the offensive against the terms of the alliance.[11] These alliances were both reorganised and expanded as more nations entered the war: Italy, Japan and the United States joined the Allies, and the Ottoman Empire and Bulgaria the Central Powers. Ultimately, more than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history.[12][13]
Although a resurgence of imperialism was an underlying cause, the immediate trigger for war was the 28 June 1914 assassination of Archduke Franz Ferdinand of Austria, heir to the throne of Austria-Hungary, by Yugoslav nationalist Gavrilo Princip in Sarajevo. This set off a diplomatic crisis when Austria-Hungary delivered an ultimatum to the Kingdom of Serbia,[14][15] and international alliances formed over the previous decades were invoked. Within weeks, the major powers were at war and the conflict soon spread around the world.
On 28 July, the Austro-Hungarians fired the first shots in preparation for the invasion of Serbia.[16][17] As Russia mobilized, Germany invaded neutral Belgium and Luxembourg before moving towards France, leading Britain to declare war on Germany. After the German march on Paris was brought to a halt, what became known as the Western Front settled into a battle of attrition, with a trench line that would change little until 1917. Meanwhile, on the Eastern Front, the Russian army was successful against the Austro-Hungarians, but was stopped in its invasion of East Prussia by the Germans. In November 1914, the Ottoman Empire joined the war, opening fronts in the Caucasus, Mesopotamia and the Sinai. Italy and Bulgaria went to war in 1915 and Romania in 1916.
The war approached a resolution after the Russian Tsar's government collapsed in March 1917 and a subsequent revolution in November brought the Russians to terms with the Central Powers. After a 1918 German offensive along the western front, the Allies drove back the Germans in a series of successful offensives and American forces began entering the trenches. Germany, which had its own trouble with revolutionaries, agreed to an armistice on 11 November 1918, ending the war in victory for the Allies.
By the end of the war, four major imperial powers—the German, Russian, Austro-Hungarian and Ottoman empires—ceased to exist. The successor states of the former two lost substantial territory, while the latter two were dismantled. The map of Europe was redrawn, with several independent nations restored or created. The League of Nations formed with the aim of preventing any repetition of such an appalling conflict. This aim failed, with weakened states, renewed European nationalism and the humiliation of Germany contributing to the rise of fascism and the conditions for World War II.
Names
In Canada, Maclean's Magazine in October 1914 said, "Some wars name themselves. This is the Great War."[18] A history of the origins and early months of the war published in New York in late 1914 was titled The World War.[19] During the Interwar period, the war was most often called the World War and the Great War in English-speaking countries.
The term "First World War" was first used in September 1914 by the German philosopher Ernst Haeckel, who claimed that "there is no doubt that the course and character of the feared 'European War' ... will become the first world war in the full sense of the word."[20] The First World War was also the title of a 1920 history by the officer and journalist Charles à Court Repington.[21] After the onset of the Second World War in 1939, the terms World War I or the First World War became standard, with British and Canadian historians favouring the First World War, and Americans World War I.
Background
In the 19th Century, the major European powers had gone to great lengths to maintain a balance of power throughout Europe, resulting in the existence of a complex network of political and military alliances throughout the continent by 1900.[11] These had started in 1815, with the Holy Alliance between Prussia, Russia, and Austria. Then, in October 1873, German Chancellor Otto von Bismarck negotiated the League of the Three Emperors (German: Dreikaiserbund) between the monarchs of Austria-Hungary, Russia and Germany. This agreement failed because Austria-Hungary and Russia could not agree over Balkan policy, leaving Germany and Austria-Hungary in an alliance formed in 1879, called the Dual Alliance. This was seen as a method of countering Russian influence in the Balkans as the Ottoman Empire continued to weaken.[11] In 1882, this alliance was expanded to include Italy in what became the Triple Alliance.[22] Bismarck had especially worked to hold Russia at Germany's side to avoid a two-front war with France and Russia. When Wilhelm II ascended to the throne as German Emperor (Kaiser), Bismarck was compelled to retire and his system of alliances was gradually de-emphasized. For example, the Kaiser refused to renew the Reinsurance Treaty with Russia in 1890. Two years later, the Franco-Russian Alliance was signed to counteract the force of the Triple Alliance. In 1904, Britain signed a series of agreements with France, the Entente Cordiale, and in 1907, Britain and Russia signed the Anglo-Russian Convention. While these agreements did not formally ally Britain with France or Russia, they made British entry into any future conflict involving France or Russia a possibility, and the system of interlocking bilateral agreements became known as the Triple Entente.

Ethno-linguistic map of Austria-Hungary, 1910
German industrial and economic power had grown greatly after unification and the foundation of the Empire in 1871. From the mid-1890s on, the government of Wilhelm II used this base to devote significant economic resources for building up the Kaiserliche Marine (Imperial German Navy), established by Admiral Alfred von Tirpitz, in rivalry with the British Royal Navy for world naval supremacy.[23] As a result, each nation strove to out-build the other in terms of capital ships. With the launch of HMS Dreadnought in 1906, the British Empire expanded on its significant advantage over its German rival.[23] The arms race between Britain and Germany eventually extended to the rest of Europe, with all the major powers devoting their industrial base to producing the equipment and weapons necessary for a pan-European conflict.[24] Between 1908 and 1913, the military spending of the European powers increased by 50%.[25]
Austria-Hungary precipitated the Bosnian crisis of 1908–1909 by officially annexing the former Ottoman territory of Bosnia and Herzegovina, which it had occupied since 1878. This angered the Kingdom of Serbia and its patron, the Pan-Slavic and Orthodox Russian Empire.[26] Russian political maneuvering in the region destabilized peace accords, which were already fracturing in what was known as "the powder keg of Europe".[26] In 1912 and 1913, the First Balkan War was fought between the Balkan League and the fracturing Ottoman Empire. The resulting Treaty of London further shrank the Ottoman Empire, creating an independent Albanian State while enlarging the territorial holdings of Bulgaria, Serbia, Montenegro, and Greece. When Bulgaria attacked both Serbia and Greece on 16 June 1913, it lost most of Macedonia to Serbia and Greece and Southern Dobruja to Romania in the 33-day Second Balkan War, further destabilizing the region.
On 28 June 1914, Gavrilo Princip, a Bosnian Serb student and member of Young Bosnia, assassinated the heir to the Austro-Hungarian throne, Archduke Franz Ferdinand of Austria, in Sarajevo, Bosnia.[28] This began a month of diplomatic maneuvering between Austria-Hungary, Germany, Russia, France, and Britain called the July Crisis. Believing correctly that Serbian officials (especially the officers of the Black Hand) were involved in the plot, and wanting to finally end Serbian interference in Bosnia,[29] Austria-Hungary delivered to Serbia the July Ultimatum, a series of ten demands intentionally made unacceptable, intending to provoke a war with Serbia.[30] When Serbia agreed to only eight of the ten demands, Austria-Hungary declared war on 28 July 1914. Strachan argues, "Whether an equivocal and early response by Serbia would have made any difference to Austria-Hungary's behavior must be doubtful. Franz Ferdinand was not the sort of personality who commanded popularity, and his demise did not cast the empire into deepest mourning".[31]
The Russian Empire, unwilling to allow Austria-Hungary to eliminate its influence in the Balkans, and in support of its longtime Serb protégé, ordered a partial mobilization one day later.[22] Germany mobilized on 30 July. Germany's war plan, the Schlieffen Plan, relied on a quick, massive invasion of France to eliminate the threat on the West, before turning east against Russia. Simultaneously with its mobilization against Russia, therefore, the German government issued demands that France remain neutral. The French cabinet resisted military pressure to commence immediate mobilization, and ordered its troops to withdraw 10 km (6 mi) from the border to avoid any incident. France only mobilized on the evening of 2 August, when Germany invaded Belgium and attacked French troops. Germany declared war on Russia on the same day.[32] Britain declared war on Germany on 4 August 1914, following an "unsatisfactory reply" to the British ultimatum that Belgium must be kept neutral.