What do you do when someone insult your friends ? Do you defend them? How? Long-term Causes of World War 1 A growing sense of nationalism and imperialism fuels competitiveness and antagonism in Europe, this leads to military buildups in many powerful nations The fears and jealousies results in the creation of two defense alliances, the Allies and the Central Powers An Assassination Leads to War The assassination of Archduke Franz Ferdinand sparks the first World War The alliance system forces many nations into the war The Fighting Starts Germany invades Belgium Armies use trench warfare to fight for small areas of land Fighting is deadlocked two years American Neutrality Although most Americans oppose entering the war public opinion is strongly divided Economic and cultural ties with Britain plus reports of German atrocities, gain American sympathy for the Allies The United States Enters the War The British naval blockade creates terrible food shortages in Germany German U boats sink British ships, and turn American public opinion against Germany Wilson is reelected in 1916 on a platform of neutrality, but events prompt the president to declare war