The course of World War II is often divided into 3 phases:
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The Early Years (1939-1941): This includes the initial invasions and conquests by Axis powers, the fall of France, and the early conflicts in the Pacific and North Africa.
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Turning Points (1941-1943): This phase includes significant battles such as the Battle of Stalingrad and the Battle of Midway, marking the shift in momentum towards the Allies.
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The Final Years (1944-1945): This phase encompasses the liberation of occupied territories, the D-Day invasion, and the steps leading to the defeat of Nazi Germany and Japan.
So, the answer is 3.