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The United States later declared war on German ally Austria-Hungary on December 7, 1917. Germanyâs resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilsonâs decision to lead the United States into World War I. Following the sinking of an unarmed French boat, the Sussex, in the English Channel in March 1916, Wilson threatened to sever diplomatic relations with Germany unless the German Government refrained from attacking all passenger ships and allowed the crews of enemy merchant vessels to abandon their ships prior ...
10 Events that Led to World War I. World War I was caused by a combination of several factors but above all, it was caused by the tensions between the European powers and crisis of the balance-of-power system that divided Europe into two camps. While one camp, joining Great Britain, France and Russia (Triple Entente) strove to preserve the fragile balance between the European great powers, the second camp that formed around German Empire, Austria-Hungary and Italy (Central Powers) was challenging it.