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THE UNITED STATES ENTERS WW1
On May 7, 1915, a German submarine sunk the Lusitania.
In 1915, Germany had instituted a policy of unrestricted submarine warfare, allowing merchant ships, but not passenger ships, to be torpedoed.
On May 4, 1916, Germany, seeking to avoid war with the US, promised to stop attacking merchant ships. This event is know as the Sussex Pledge.
On March 1, 1917, President Wilson released a telegraph sent to Mexico by the German foreign minister, Arthur Zimmerman. The telegraph proposed that if the US entered the war, Mexico should become an ally of Germany. In return,Germany would help recover Mexico's lost territory.
After the Zimmerman note and Germany's continuation of submarine warfare, on April 2, 1917, President Wilson finally urged Congress to declare war. The US entered WW1 4 days later, on April 6, 1917.
The world must be safe for democracy
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