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World War II
Concept

World War II

Global conflict from 1939 to 1945 involving most of the world's nations, resulting in approximately 70–85 million deaths and reshaping the international order.

Last refreshed: 8 May 2026

Timeline for World War II

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Common Questions
What parallels are being drawn between the Iran conflict and World War II?
The Iran-conflict-2026 briefing references the Gulf of Tonkin rather than World War II directly; WWII appears as a historical frame for precedent around naval incidents triggering escalation and the difficulty of managing dual military-diplomatic tracks in wartime.Source: Lowdown
How did World War II affect international law on maritime conflicts?
World War II's aftermath produced the UN Charter (1945) and subsequent conventions on the laws of armed conflict at sea, including rules on naval blockades, maritime exclusion zones and the rights of neutral shipping that directly underpin today's debates over the Strait of Hormuz.

Background

World War II (1939-1945) was the largest armed conflict in history, involving most of the world's nations in two opposing military alliances: the Allied Powers (led by the United Kingdom, Soviet Union and United States) and the Axis Powers (led by Germany, Italy and Japan). The conflict resulted in approximately 70-85 million deaths, including an estimated 6 million Jewish victims in the Holocaust. It ended with unconditional Axis surrenders in Europe (May 1945) and the Pacific (September 1945), following the use of nuclear weapons against Hiroshima and Nagasaki. The post-war settlement established the United Nations, Bretton Woods institutions, and the framework of international law that has governed state conduct since.

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