Another name for World War I is . Nationalism, alliances, militarism, and were all long-term causes of World War I. had people of diverse ethnicity who spoke many languages. It included the nations of Serbia, Bulgaria, Greece, and Montenegro. The longest battle of World War I was . was the leader of the Bolsheviks and successfully led the Russian Revolution. The was the alliance that included Germany, Austria-Hungary, and Bulgaria. The United States declared war on Germany after discovering that the Germans made an offer to Mexico in the . Respond to the following based on your reading. Why was the Battle of the Somme significant? How was World War I dramatically different from previous wars?