War (Event)

A war is an armed conflict between two societies.

History
World War II was an Earth-spanning conflict involving Nazi Germany fighting United Kingdom, France, and the United States of America. During the conflict, the Nazis put Jews into internment camps during the Holocaust.

Magneto, a survivor of the Holocuast, worried that humans would threaten a war with mutants and threatened to start the conflict himself.

The Cold War was between the Soviet Union and United States. It was not an actual armed conflict but a period of geopolitical tension.

World War III is a theoretical war.

Apocalypse named one of his Horsemen War after the Christian personification of war.