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Both Archduke Ferdinand and his wife were assassinated by Gavrilo Princip. This started the Austrians fighting the Serbians and started WW1. Archduke Ferdinand was the leader of Austria.
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Britain declared war on Germany. The US declares it's neutrality. Neutrality means that they don't take one or the other side.
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A German U-Boat (submarine) sinks Lusitania and it killed 1,201 people including 128 Americans. Woodrow Wilson sends four diplomatic protests to Germany. The US blames Germany.
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American voters re-elected Woodrow Wilson who had companied on the slogan "He has kept us out of war." At this time most Americans don't want to be in the war.
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The British intercept a message talking about Germany and Mexico having a alliance. The message goes public and some Americans think we should be in the war.
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The US declared war on Germany and joined other forces. This brings the US into WW1.
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The first American troops arrive in France. The US helped France and was getting closer to war.
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The Sedition act is passed it made it against the law to be critical of the government, and it's part in WW1.
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An agreement was signed between Germany and the allies to end WW1. That means Americans will come home from the war.
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Peace treaty was signed to officially end WW1. The treaty said that Germany was responsible for starting WW1 and made them pay money and give up land.