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The Deadliest Wars

Given the various hints, name the 20 deadliest wars of all time.
Some of these wars are actually collections of many smaller wars, but are often referred to by a common name due to their similar causes and related natures.
Based off of this Wikipedia list.
Minor belligerents are omitted in some cases.
Numbers are based off of the total deaths, including all deaths directly caused by the war, such as civilian casualties, genocide, biological warfare, and induced famine.
Quiz by QuantumMechanist
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Last updated: October 19, 2020
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First submittedOctober 19, 2020
Times taken143
Average score40.0%
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Cause
Death Toll (Aprx.)
Dates
Belligerents
Answer
The invasion of Poland by Germany; The invasion of China by Japan
70M
1939-1945; 1937-1945
Allies (United Kingdom, United States, France, Soviet Union, others) vs. Axis (Germany, Italy, Japan, others)
World War II
The collapse of the Han Dynasty resulted in many warlords rising up and battling among each other for rule over all of China.
38M
220-280
Wei Kingdom vs Shu Kingdom vs Wu Kingdom (also vs Yan Kingdom)
The Three Kingdoms War
A newly united people in Central Asia, led initially by Genghis Khan and later by others, expands its influence over Asia and Europe
35M
1206-1368
The Mongol Empire vs. Abbasids, Egypt, Hungary, Japan, Novgorod, Poland, Qara Khitai, Song Dynasty, and many others
The Mongol Conquests
Growing discontent regarding the Tang Dynasty, coupled with a series of various disasters and a union under General An, leading to uprising
25M
755-763
Tang Dynasty and Uyghur Khaganate vs. Yan State
An Lushan Rebellion
Lax military regulations led to widescale rebellions across Chine, one of which prompted the government to purposely flood the Yellow River. A rising rival faction took advantage of these weaknesses.
25M
1618-1683
Qing Dynasty vs Ming Dynasty and Joseon vs Shun vs Xi vs others
Transition from Ming to Qing
In the fallout of the First Opium War, the Qing Dynasty suffered many disasters it could not afford to handle, and many people under its rule were suffering. The Self-Proclaimed brother of Jesus led his own holy kingdom in an effort to conquer, and convert China.
25M
1850-1864
Qing Dynasty, (Later) United Kingdom, and (Later) France vs the Taiping Heavenly Kingdom and other rebels
Taiping Rebellion
The complicated webs of alliances left in the wake of the unifications of Germany and Italy, along with the increasing militarization of European countries, tripled with the ethnic tensions in the Balkans due to centuries of subjugation all boiled over upon the assassination of Archduke Franz Ferdinand
16M
1914-1918
Allied Powers (United Kingdom, United States, France, Russia, Serbia, and others) vs Central Powers (Germany, Austria-Hungary, Ottoman Empire, and others)
World War I
After the collapse of the Mongol Empire, the Timurid Empire began its expansion over much of Southwest and Central Asia
14M
1370-1405
Timurid Empire vs Golden Horde, Kartid Dynasty, Mihrabanid Dynasty, Ottoman Empire, Qing Dynasty, Tughlaq Dynasty, and many others
Conquests of Timur
During the events of #6, many cities and states along the war path built up Han militias. Fearful of these, the Muslim minorities built up their own, exploding into full out war.
14M
1862-1877
Qing Dynasty vs Kashgaria (supported by United Kingdom and Ottoman Empire) vs Hui Muslims and other rebels
Dungan Revolt
The newly formed Republic of China decided to fully ban Communism under penalty of death over fears that the USSR was exerting too much influence. Mao Zedong proceeded to lead the Communists and gain popular support, throwing the entire country into war.
9M
1927-1949
Republic of China (supported by (early) Germany, (later) United States, and others) vs People's Republic of China (Supported by USSR and others)
Chinese Civil War
The Spanish conquistadors claimed the land where the Inca Empire ruled.
8.4M
1533-1572
Spanish Empire and various Native American allies vs the Inca Empire
Spanish Conquest of the Inca Empire
Rising tensions between various Central European countries culminated in the Bohemian Revolt and this war
8M
1618-1648
Non-Imperial Alliance (Bohemia, Palatinate, Dutch Republic, Denmark-Norway, Sweden, Heilbronn League, Saxony, Brandenburg-Prussia, and France) vs Imperial Alliance (Hapsburg Monarchy, Spanish Empire, Electorate of Bavaria, and Catholic League)
Thirty Years' War
Discontent among the Russian populace, along with an increasingly weaker central government, result in a bloody rebellion and subsequent war
7M
1917-1923
Bolsheviks (Later the Soviet Union) vs Russian Republic. A large and varied amount of supporters on both sides and neither.
Russian Civil War
The Congolese government that took power in 1997, led by Rwandan-Supported Kabila, forced Rwandan and Ugandan forces to leave the country, leading to rebellion by Bayanmulenge and drawing in a large portion of the countries in Africa
5.4M
1998-2003
Democratic Republic of the Congo, Angola, Chad, Namibia, Zimbabwe, and others vs Rebel Militias, Rwanda, Uganda, and Burundi
Second Congo War
The Maratha People of the Indian Subcontinent declared independence from the Mughal Empire.
5M
1680-1707
Maratha Empire vs Mughal Empire
Mughal-Maratha War
After the slight decreasing of Roman military presence in Northern Africa, the Moors rose up and fought for independence.
5M
535-547
Moors vs Byzantine Empire
Moorish Wars
Once again united after a series of civil wars, the new monarchy of France stablized the country and began challenging other countries. After challenging Britain and fighting an ensuing war, Britain formed a coalition with Russia and the Swiss confederation, starting France on its expansive conquests across Europe.
5M
1803-1815
French Empire vs Austria, Prussia, Russia, United Kingdom, and many others
Napoleonic Wars
PRC-Aided Viet Minh fought for an ideological change in the government of Vietnam, drawing in French and United States attention and military action.
3.4M
1955-1975
North Vietnam, Pathet Lao, China, Soviet Union, and others vs South Vietnam, United States, South Korea, and others
Vietnam War
A rising self-determination movement during the Bangladesh genocide sparked into war.
3M
1971
Bangladesh and India vs Pakistan
Bangladesh Liberation War
An ideological war of revolution in Korea, drawing the attention of global superpowers.
3M
1950-1953
South Korea and the United Nations vs. North Korea and China
Korean War
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