What was not a reason that president woodrow wilson declared war on germany in 1917? a. the interception and disclosure of the zimmerman note by great britain b. germany's unrestricted submarine warfare on united states' vessels in the atlantic ocean c. the start of the russian revolution d. the spread of anti-german sentiment in the united states

Correct  C. The start of the Russian Revolution

Detail:  The USA declared war in April, 1917.  There was some revolution activity in Russian the spring of 1917, but the main "Russian Revolution" as led by the Bolsheviks started in October, 1917.

Context:

Public outrage in the US against the Germans swept the nation following the sinking of the British ocean liner, Lusitania -- but that happened before 1917.  When a German U-boat (submarine) sank the Lusitania in May, 1915, over 1,000 persons were killed, including more than 100 Americans. The passenger liner was targeted by the Germans because they suspected weapons were being shipped to Britain in the cargo hold of the ship.

Germany managed to stave off American entry into the war at the time by pledging to stop submarine attacks.  But a couple years later they resumed such attacks, and there was also an intercepted telegram (the "Zimmerman Telegram") that showed Germany was trying to secure Mexico as an ally against the United States.  

In 1917, the US declared war on Germany in response.

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explanation: