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US joins WWI

Definition

The United States joined World War I in April 1917, nearly three years after the war began. President Woodrow Wilson initially sought neutrality for the U.S., but escalating submarine warfare by Germany against American ships led to U.S.'s entry into the war.

Analogy

Imagine you're at a park watching some kids play soccer. You don't want to join because you're enjoying your peace and quiet (neutrality). But then, one of them kicks the ball and it hits you (submarine warfare). That's when you decide to get up and join the game (US joining WWI).

Related terms

Zimmermann Telegram: This was a secret diplomatic communication issued by German Foreign Office proposing military alliance between Germany and Mexico if United States entered WWI against Germany. Its interception by British intelligence was one factor leading US into war.

Selective Service Act: Passed by Congress in May 1917, this law required men aged 21-30 to register for military draft, enabling US to raise an army quickly upon entering WWI.

Treaty of Versailles: Signed on June 28, 1919, this treaty officially ended state of war between Germany and Allied Powers. It held Germany responsible for starting WWI and imposed heavy penalties on them.