World Population Review

The Oxford English Dictionary defines “war” as: (1) A state of armed conflict between different countries or different groups within a country; (2) a state of competition or hostility between different people or groups, or (3) a sustained campaign against an undesirable situation or activity. There are many possible reasons for war to begin between—or more often, within—nations. Among these are economic gain, territorial gain, religion, nationalism, civil war, and political revolution. Often, countries’ leaders become primary motivators of conflict by instigating a territorial dispute, trying to control another country’s natural resources, or exercising authoritarian power over people.

Not all wars are formalized with official declarations of war between combatants. Conversely, not every ongoing armed conflict is classified as a war. This article will use the Uppsala Conflict Data Program definition, which described war as “a state-based conflict or dyad which reaches at least 1000 battle-related deaths in a specific calendar year.” Fatality figures include any combatants killed in action as well as any civilians who were deliberately killed (for example, by bombings or other attacks).

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