A global conflict between two coalitions (the Allies and the Central Powers) that occurred in the early 20th century, also known as the First World War or the Great War
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The Allies
One of the two main coalitions in World War I, which included major powers such as Britain, France, Russia, and later the United States
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Central Powers
One of the two main coalitions in World War I, which included Germany, Austria-Hungary, Ottoman Empire, and Bulgaria
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Major regions affected by World War I
Europe and the Middle East were the primary areas of conflict, with additional fighting in parts of Africa and the Asia-Pacific
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Tanks
A new military technology developed and used during World War I that provided armored protection and mobility on the battlefield
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Chemical weapons
A type of weapon used in World War I that caused significant casualties and represented a major development in warfare technology
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Machine guns
Rapid-fire weapons that became a dominant feature of World War I combat, particularly in trench warfare
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Artillery in World War I
Large-caliber guns that were significantly developed and heavily used during World War I, causing widespread destruction
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Military casualties in World War I
Approximately 30 million military personnel were killed or wounded during World War I, making it one of the deadliest conflicts in history
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Civilian deaths in World War I
An estimated 8 million civilians died from war-related causes and genocide during World War I
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Spanish flu pandemic
A deadly pandemic that spread globally during World War I, facilitated by the movement of large numbers of military personnel and refugees
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Deadliest conflicts in history
World War I is classified as one of the deadliest conflicts in human history due to the combined military and civilian death toll of approximately 38 million people