War is organized and often prolonged conflict carried out by state or non-state actors. It is characterized by extreme violence, social disruption, and attempted economic destruction. It is a form of collective political violence or intervention. The absence of war is known as peace. It is disputed whether warfare is inescapable or inevitable, with some arguing that some human societies do not engage in warfare. The deadliest wars in terms of cumulative deaths include:
WWII (Second World War, 1939-1945), with 60-85 million deaths
Mongol conquests (13th century), with 60 million deaths
Taiping Rebellion (1850-1864), with 40 million deaths
WWI (World War 1, 1914-1918), with 39 million deaths
An Shi Rebellion (755-763), with 36 million deaths
Second Sino-Japanese War (1937-1945), with 20 million deaths
Conquests of Tamerlane (1370-1405), with 20 million deaths
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