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  2. American entry into World War I - Wikipedia

    en.wikipedia.org/.../American_entry_into_World_War_I

    The United States Senate, in a 74 to 0 vote, declared war on Austria-Hungary on December 7, 1917, citing Austria-Hungary's severing of diplomatic relations with the United States, its use of unrestricted submarine warfare and its alliance with Germany. [137]

  3. United States L-class submarine - Wikipedia

    en.wikipedia.org/.../United_States_L-class_submarine

    The United States L-class submarines were a class of 11 coastal defense submarines built 1914–1917, and were the most modern and capable submarines available to United States Navy when the country entered World War I. Despite being considered a successful design by the USN, war experience in European waters demonstrated that the boats lacked ...

  4. Unrestricted submarine warfare - Wikipedia

    en.wikipedia.org/wiki/Unrestricted_submarine_warfare

    In 1922 the United States, the United Kingdom, Japan, France and Italy signed the Washington Treaty on Poison Gas and Submarines, to so restrict the use of submarines as to make them useless as commerce raiders. [10] France did not ratify, so the treaty did not go into effect. In 1936, states signed the London Protocol on Submarine Warfare.

  5. Category : World War I submarines of the United States

    en.wikipedia.org/wiki/Category:World_War_I...

    Pages in category "World War I submarines of the United States" The following 100 pages are in this category, out of 100 total.

  6. United States Navy operations during World War I - Wikipedia

    en.wikipedia.org/wiki/United_States_Navy...

    The United States Navy focused on countering enemy U-boats in the Atlantic Ocean and the Mediterranean Sea while convoying men and supplies to France and Italy. Because of United States's late entry into the war, her capital ships never engaged the German fleet and few decisive submarine actions occurred. [1]

  7. Zimmermann telegram - Wikipedia

    en.wikipedia.org/wiki/Zimmermann_Telegram

    On February 1, Germany announced resumption of "unrestricted" submarine warfare, an act that led the United States to break off diplomatic relations with Germany on February 3. [24] The telegram, completely decrypted and translated. Hall passed the telegram to the British Foreign Office on February 5 but still warned against releasing it.

  8. List of World War I U-boat commanders - Wikipedia

    en.wikipedia.org/wiki/List_of_World_War_I_U-boat...

    Von Trapp (1880–1947) was the most successful Austro-Hungarian submarine commander of the war. In addition to 11 merchant ships, he also sank the French armored cruiser Léon Gambetta and the Italian submarine Nereide. After the war, he lost most of his money, which had been deposited in an Austrian bank that failed.

  9. USS L-10 - Wikipedia

    en.wikipedia.org/wiki/USS_L-10

    Assigned to the Atlantic Submarine Flotilla, L-10 operated along the United States East Coast until April 1917 developing new techniques or undersea warfare. Following the United States's entry into World War I, submarines were needed to protect Allied shipping lanes to Europe.