World War II (1938-1945) – With a death toll between 40 and 85 million, the Second World War was the deadliest and worst war in history. Experts estimate with such a high death toll, about three percent of the world's population in 1940 died.
By far the most costly war in terms of human life was World War II (1939–45), in which the total number of fatalities, including battle deaths and civilians of all countries, is estimated to have been 56.4 million, assuming 26.6 million Soviet fatalities and 7.8 million Chinese civilians were killed.
The longest war in history is believed to be the Reconquista (Spanish for Reconquest), with a duration of 781 years.
The British issued an ultimatum to Khālid: either relinquish the throne by 9:00 am on August 27 or be at war with Great Britain. Khālid did not stand down, and the Anglo-Zanzibar War followed. Having lasted less than an hour before Khālid's forces surrendered, it is considered the shortest war in recorded history.
Wars between ethnic or ideological groups can become forever wars, as such wars are harder to end with a negotiated peace deal due to the different interests of the two sides. Religious wars may also make it harder since it is often prophesized divinely on both sides that the other must be destroyed.
But both Hitler and Stalin were outdone by Mao Zedong. From 1958 to 1962, his Great Leap Forward policy led to the deaths of up to 45 million people—easily making it the biggest episode of mass murder ever recorded.
Regardless of what you call it, the Civil War battle that took place on Wednesday, Sept. 17, 1862, remains the bloodiest day in American history. The most accurate estimate comes in at 22,717 casualties — 12,401 Union soldiers and 10,316 Confederates.
It is estimated that between 2.3 and 3.3 million people probably lost their lives either directly or indirectly as a result of the protracted conflict between France and England.
The War of 1812; The War Nobody Won; The War Nobody Lost and The War Nobody Remembers. Over two hundred years ago on June 18, 1812 the young republic of the United States of America declared war on Great Britain, then the World's greatest power.
However, the US was unable to get any significant victory in its wars abroad. America fought five major wars after 1945 including Korea, Vietnam, Gulf War, Iraq, and Afghanistan in addition to some minor wars in Somalia, Yemen, and Libya. Except for the Gulf War in 1991, America lost all other wars.
The Hundred Years' War (1337–1453) was a series of conflicts fought between England and France over succession to the French throne.
The heaviest loss of life for a single day occurred on July 1, 1916, during the Battle of the Somme, when the British Army suffered 57,470 casualties.
This milestone has prompted researchers to work out how many people have ever existed. They estimate that 109 billion people have lived and died over the course of 192,000 years. And that 7% of all humans who have ever lived are alive today.
The Napoleonic Wars (1803 – 1815)
His victory at Austerlitz in 1805 is perhaps one of the best examples. Under Napoleon, some of the conflicts France won were the Wars of the Third, Fourth and Fifth Coalitions, all of which saw the defeat of Britain and her allies.
There were 20 million deaths and 21 million wounded. The total number of deaths includes 9.7 million military personnel and about 10 million civilians. The Entente Powers (also known as the Allies) lost about 5.7 million soldiers while the Central Powers lost about 4 million.
The American Civil War is the conflict with the largest number of American military fatalities in history. In fact, the Civil War's death toll is comparable to all other major wars combined, the deadliest of which were the World Wars, which have a combined death toll of more than 520,000 American fatalities.
Estimates of the total number of people killed during World War II have ranged from 35,000,000 to 60,000,000—a significant span, because statistics about the war's casualties are inexact.
According to Genesis, Cain was the first human born and the first murderer.
With 2,746 confirmed kills, Sgt. 1st Class Dillard Johnson is the deadliest American soldier on record — and maybe the most humble.
Cod Wars: one man killed, one man wounded. Toledo War: one man wounded. Battle of Athens (1946): several wounded.
Of those, 5,364 died in action, and another 1,476 died in non-hostile incidents. This gives the latest, ongoing wars a death rate of 0.27%, according to the VA's numbers.
Arms control and diplomacy remain essential strategies for stopping war, but the roots of war must also be addressed. The law enforcement/military approach to countering terrorism may weaken terrorist groups, but it also may increase their will to fight and popular support for their cause and endanger civil liberties.
A war can only be just if it is fought with a reasonable chance of success. Deaths and injury incurred in a hopeless cause are not morally justifiable.