World War I (1914–1918) was a global war centered in Europe that eventually drew in nations from around the world.

The United States entered the war in 1917, helping to bring about its end.

KEY MOMENTS

• World War I begins in 1914

• The U.S. enters the war in 1917

• Trench warfare defines much of the conflict

• The war ends in 1918

WHY IT MATTERS

World War I reshaped global alliances and set the stage for future conflicts.

REFLECTION

It marked the beginning of modern global warfare and international involvement.

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