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World War I

Grade 7 · History · Free lesson

Hi there! Let's explore World War I together and see why the United States decided to join the fight.

World War I started in Europe in 1914. It was caused by a mix of secret alliances, strong national pride, and big countries competing for land.

soldier

At first, the United States chose isolationism. This meant staying out of other countries' wars and focusing on peace at home.

U.S.A.EUROPEIsolationism

Two big events forced the U.S. to enter the war in 1917. First, German submarines sank American merchant ships. Second, the secret Zimmermann telegram asked Mexico to attack the U.S.

Submarine Attacks
✏️ Worked example

Let's practice our historical thinking skills. Imagine you are analyzing a speech from a U.S. leader in 1914. How do you explain why the U.S. wanted to stay neutral, and what evidence shows they changed their minds later?

  1. First, find the main goal of the 1914 speech. The goal was to keep America safe by staying neutral, which is called isolationism.
  2. Next, look at the geography. A large ocean separated the United States from the fighting in Europe, making isolationism easier.
  3. Then, identify the turning points. We look at historical facts like German submarine attacks that sank American ships.
  4. Finally, explain the change. The U.S. entered the war because these attacks and the secret Zimmermann telegram threatened national safety, making isolationism impossible to keep.
lost places
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