In the aftermath of the sinking of the British passenger liner Lusitania,

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Following the sinking of the Lusitania, Germany pledged to the United States that it would not repeat such an action. This pledge was known as the Sussex Pledge and temporarily eased tensions between the two countries. The United States did not declare war on Germany until 1917, after several other incidents and an intensification of German submarine warfare. President Wilson did not prohibit Americans from traveling to Europe, but he did issue warnings about the danger of doing so. Great Britain already had a strong submarine fleet at the time of the sinking of the Lusitania, and the United States did not begin leasing its submarines to Great Britain until after it entered World War I.

In the Aftermath of the Sinking of the British Passenger