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The two World Wars of the 20th century helped to define the global politics of their time. World war is conventionally defined as an interstate war fought between leading military powers supported by their respective alliance blocs where the scope of military engagement, on land and sea and in the air, extends across several world regions and where every continent is in some way impacted by the fighting. World war is synonymous with total war as it involves the mobilization of entire societies into the war effort as volunteer and conscripted military personnel, as workers in armaments and munitions factories, or on the land as part of intensified food production campaigns to sustain the high proportion of young working-age men committed to the field of battle.

The term is commonly associated with the two major interstate wars of the 20th century: World War I (1914–1918) and World War II (1939–1945). The global scope of both World Wars reflected the emergence of powerful industrial states capable of generating sufficient capital, primarily through highly centralized systems of taxation, to fight to defend or extend their global interests. European industrialization and associated rapid population growth transformed modern war making into a heavily industrialized process. In the 20th century, major powers fielded significantly larger forces that were better armed, better equipped, and better trained than their forebears. This correspondence between the rise of industrial mass production and the mass mobilization of people and industry for world war suggests a correlation between war making and the prevailing mode of economic organization. It is argued that the highly fragmented nature of 21st-century economic globalization makes it unlikely that the world will again witness such concentrated and protracted mass deployments of military personnel and materiel.

World War I

Initially referred to as the “Great War,” the war of 1914–1918 was elevated retrospectively to world status as historians sought a new vocabulary to capture the enormity of the struggle and to distinguish it from previous conflicts. The war began as a European “civil war” between Germany, France, Britain, Russia, Italy, and Austria-Hungary, but spread quickly to engulf the German-aligned Ottoman Empire. By 1915, there were three key theaters of war: in Europe on the Western Front through France and Belgium, the Russian or Eastern Front, and on the margins of the Ottoman Empire, including the attempted British invasion of the Dardanelles at Gallipoli. German possessions in the Southwest Pacific were quickly confiscated and at negligible cost by Australian forces after the outbreak of war in August 1914.

The scope of World War I is directly related to the spread of imperial globalization in the 19th century. British and French colonies in Asia and Africa supplied troops and military equipment for their respective imperial war efforts. On the British side, fighting forces were drawn from North America, Asia, the Pacific, and Africa. On the French side, troops were drawn from North and West Africa and Asia. Although not an active combatant, Japan, too, declared war on Germany in 1914 and, as an ally of Britain, Japanese naval vessels guarded Australian and New Zealand military transports travelling across the Indian Ocean to the Middle East and Europe. The United States entered the war on the side of Britain, France, and Russia in 1917 and committed troops to the front. Many other nations, from Asia and Latin America, joined the war in name only, including Nationalist China, which declared war on Germany and Austria in 1917.

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