Which of the following actions by Germany led to the end of U. S. neutrality during World War I? The use of unrestricted submarine warfare
The use of unrestricted submarine warfare

The assassination of Archduke Franz Ferdinand
The assassination of Archduke Franz Ferdinand

Germany's treatment of prisoners of war
Germany's treatment of prisoners of war

The invasion of Russia

The United States later 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. Why did the U.S end it's neutrality during World War I? This was a product of a longstanding idea at the heart of American foreign policy that the United States would not entangle itself with alliances with other nations. Put simply the United States did not concern itself with events and alliances in Europe and thus stayed out of the war.

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explanation:

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post the grid otherwise i cant .

also it sounds like a math question not history.