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Archduke Ferdinand assassinated by Gavrilo Princip, a Serbian
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The US built a canal in the middle of Panama, the narrowest part of Central America. This reduced the time it took to travel across the US. Roosevelt struck a deal with Panamanian rebels who wanted independence, giving the US control over the Panama Canal Zone.
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Germany issues order stating that any ships entering the British Isles will be sunk
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Germany sinks Passenger ship that crossed into the warzone, killing 1260 people, 120 of which were Americans.
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Britain intercepts telegram sent by Germany to Mexico, asking them to attack US in exchange for territory.
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Required American males to enlist for the army, between ages 21-30. 10 million soldiers enlisted in a few months.