The history of war goes back by millennia. Among the earliest wars was one in Egypt in about 3,000 BCE. Alexander the Great fought a series of battles around 330 BCE. While some of these wars probably took tens of thousands of lives, modern warfare, with larger armies and more advanced weapons, pushed death tolls much higher.
What is called “modern war” began about the year 1800. It was characterized by the wide use of gunpowder and heavy weapons, which included, in particular, cannons. The earliest of these were the Napoleonic Wars (1803 to 1815). These had another characteristic. They were fought over large geographic areas that included multiple nations.
While the American Revolutionary War (1775 to 1783) was the first war fought on U.S. soil, the total number of combatants killed was about 20,000, and civilian deaths were approximately the same. That total is horrible, but it does not compare at all with the next war fought in the United States. Civil War deaths have been counted as high as 850,000.
Most major wars that occurred after the Civil War were fought between two or more countries. Among the exceptions are the Chinese Civil War, which started in 1927 and ran until 1950. It is estimated to have killed 8 million combatants and civilians.
Navies were an early change in how wars were fought. Another major change in warfare tactics was the use of aircraft as weapons. Planes were not widely used until World War I and eventually evolved to the point where they could level entire cities, which first happened in World War II.
World War II was fought across virtually all of Europe and much of the Pacific, and a number of armies were involved, including soldiers from India. The war in the Pacific theater ended with the atomic bombs dropped on Hiroshima and Nagasaki, which are estimated to have killed 200,000 people.
World War II is the war in which the most people were killed, although it ended more than 75 years ago. Over the course of the war, it is estimated that 70 million people were killed. Most of these were civilians.
Click here to read about the 18 biggest battles of World War II.
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