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lailasmith

Answer:

The United States declared war on German ally Austria-Hungary on December 7, 1917. Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson's decision to lead the United States into World War I.

fun54658

Answer:

Germany's decision to resume unrestricted submarine warfare

Explanation:

Germany’s decision to resume unrestricted submarine warfare was an immediate cause for the entry of the US into World War I. While the timing was great, Russia's exit from the war was not a factor in the U.S.'s decision to enter.

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