List of Significant and Deadliest Wars

World War 2 - 85 million deaths

The Three Kingdoms War - 40 million deaths

Vietnam War - 3.8 million deaths

World War 1 - 17 million deaths

Siege of Jerusalem - 1.1 million deaths

Taiping Rebellion - 20 million deaths

Thirty Years' War - 11.5 million deaths

Dungan Revolt - 10 million deaths

French Wars of Religion - 4 million deaths

Gulf War - 1 million deaths

Korean War - 1.2 million deaths

Mexican Revolution - 2 million deaths

Mongol Invasions and Conquests - 70 million deaths

Napoleonic Wars - 6 million deaths

Russian Civil War - 9 million deaths

Second Sino-Japanese War - 20 million deaths

Seven Years' War - 1.4 million deaths

An Lushan Rebellion - 13 million deaths

Chinese Civil War - 7.5 million deaths

Conquests of Mehmed II the Conqueror - 873,000 deaths

The American Civil War - 618,000 deaths