The modern world (1500 AD–present) has witnessed several deadly wars and conflicts that have, unfortunately, resulted in significant loss of life. Furthermore, various factors have contributed to these devastating events. Additionally, the following list highlights the deadliest wars of the modern world by death range. Consequently, understanding these historical conflicts offers valuable insights into their lasting impact on society.
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deadliest wars of the modern world
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The deadliest wars of the modern world
deadliest wars of the modern world
Mughal–Maratha Wars - 5,000,000+
© Aurangzeb
The Mughal-Maratha Wars were a series of conflicts that took place in the Indian subcontinent during the 18th century between the Mughal Empire and the Maratha Empire. These wars were primarily territorial and political in nature, as both empires sought to expand their influence and control over different regions of India. While the Mughals and Marathas engaged in a series of wars, neither side could completely defeat the other.
Chinese Civil War - 8,000,000–11,692,000
© xtimeline.com
The Chinese Civil War was a protracted conflict that took place in China from 1927 to 1950. It was primarily fought between the Chinese Nationalist Party (Kuomintang or KMT), led by Chiang Kai-shek, and the Chinese Communist Party (CCP), led by Mao Zedong. Furthermore, the civil war had resulted in a massive loss of life and widespread destruction in China, and it left a legacy of political division that continues to influence cross-strait relations between China and Taiwan.
Dungan Revolt - 8,000,000–20,000,000
© Boiarskii, Adolf-Nikolay Erazmovich
The Dungan Revolt, also known as the Hui people’s War, was a major ethnic and religious conflict that took place in the late 19th century in northwestern China, particularly in Shaanxi, Gansu, and Ningxia. The Hui people, predominantly a Muslim ethnic group of Chinese descent, led the revolt. Ultimately, the Dungan Revolt caused significant loss of life and property damage in these affected regions.
Spanish conquest of the Inca Empire - 8,400,000+
© Etteine Jovi
The Spanish conquest of the Inca Empire, which took place in the early 16th century, was a pivotal event in the history of the Americas. Moreover, it resulted in the downfall of the powerful Inca civilization and the establishment of Spanish colonial rule. Consequently, the Inca population was decimated by European diseases to which they had no immunity, leading to a significant population decline.
World War I - 17,000,000
© Hermann Rex (1884–1937)
World War I, also known as the Great War, was a global conflict that lasted from 1914 to 1918. It was one of the most significant and destructive wars in history and had far-reaching political, social, and economic consequences. Moreover, World War I had profound and lasting consequences. Furthermore, it left millions dead and wounded, and consequently, it caused widespread destruction. Additionally, the war reshaped national boundaries and altered the course of history.
Second Sino-Japanese War - 20,000,000–25,000,000
© H. S. Wong
The Second Sino-Japanese War, also known as the Second Sino-Japanese War of Resistance against Japan or simply the Second World War in China, unfolded in China from 1937 to 1945. Moreover, the war caused immense suffering and widespread destruction. Additionally, millions of Chinese civilians and soldiers lost their lives during this brutal conflict.
Taiping Rebellion - 20,000,000–70,000,000
© Wu Youru
The Taiping Rebellion was a massive and devastating civil war that occurred in China from 1850 to 1864. It was also one of the deadliest conflicts in human history, with millions of casualties. Moreover, the Taiping Rebellion caused immense devastation. Cities were laid to waste, and millions of people died as a result of warfare, famine, and disease.
Spanish conquest of the Aztec Empire - 24,300,000+
© libertaddigital.com
The Spanish conquest of the Aztec Empire, which took place in the early 16th century, is one of the most significant events in the history of the Americas. It marked the beginning of Spanish colonization in the Americas and the establishment of New Spain, which would become Mexico. The conquest also had devastating consequences for the indigenous population, as they were exposed to new diseases brought by the Spanish, resulting in a significant population decline.
Transition from Ming to Qing - 25,000,000+
© 清实录
The transition from the Ming Dynasty to the Qing Dynasty created a tumultuous period in Chinese history, marked by significant upheaval and loss of life. During this period, widespread violence and chaos unfolded as various rebel groups, bandits, and regional warlords fought for power and control. Additionally, peasant uprisings, including the one led by Li Zicheng, caused significant loss of life among both rebels and civilians.
World War II - 80,000,000
© Mmxx
World War II (WWII) was one of the most significant and devastating conflicts in human history, lasting from 1939 to 1945. It caused an estimated 80 million deaths, making it the deadliest conflict in history. Additionally, this number includes military and civilian casualties, along with victims of the Holocaust.

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