Advanced Placement-Style United States History
  Question of the Day--Answer and Explanation

British troops in a trench during the Battle of the Somme, 1916
Image Source: Wikimedia Commons (public domain)
Question 993:

The most influential factor in President Wilson's decision to abandon neutrality and support the Allies in World War I was

        (A) Germany's invasion of Belgium
        (B) Germany's use of nerve gas
        (C) British propaganda
        (D) anti-German hysteria in the U.S.
        (E) Germany's resumption of unrestricted submarine warfare     
Answer:
        (E) Germany's resumption of unrestricted submarine warfare 
Explanation:

Following the sinking of the Sussex in 1916, the U.S. threatened breaking off diplomatic relations with Germany unless submarine attacks were halted. Germany responded with the Sussex Pledge, exempting passenger ships from attacks and limiting attacks on merchant ships. In January 1917 Germany, convinced of the need to conclude the war, resumed unrestricted submarine warfare. The U.S. declared war on Germany in April 1917.
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