What is nature of war?

Warfare is an armed conflict involving engagements of military forces. Warfare comes with death tolls. As an example, millions and thousands of more people were killed in war throughout U.S. military history. World War II is the deadliest war in military history with the amount of 60,000,000-85,000,000 people who were killed in World War II. From events such as the Holocaust, attack on Pearl Harbor, war crimes such as massacres, strategic bombings, and battles of World War II. The Cold War included many armed conflicts such as the Vietnam War and the Korean War. Also, there are ongoing wars such as the War in Afghanistan (Global War on Terrorism) and the Mexican Drug War.

There are 6 eras of warfare throughout history:

Prehistoric Warfare

Ancient Warfare

Medieval Warfare

Early Modern Warfare

Industrial Warfare

Modern Warfare (the current era of warfare)