=The Leading Facts.= _1._ This war was so great that it needed the support of every American citizen. _2._ People at home had to do without many things needed by the army and by the Allies. _3._ Nearly all the great powers of Europe were drawn into the war. _4._ Germany, contrary to treaty, invaded Belgium. _5._ The German navy was quickly driven from the seas, and Germany was blockaded. _6._ The American government remained neutral, but most of its people favored the Allies. _7._ Germany sank the _Lusitania_ and other vessels illegally. _8._ President Wilson did not lead the nation into war until the people were unitedly in favor of it. _9._ When Germany declared that her submarines would obey no law, and the United States entered the war. _10._ Congress voted billions of dollars for war. _11._ A selective draft raised a great national army. _12._ The part of the average man in this war stands out more than that of famous leaders. _13._ This was a war of science, and by far the greatest war in history. _14._ Pershing was given command of the American army. _15._ When Russia withdrew from the war Germany used her extra troops for a final great attack. _16._ Foch was put in command of all the Allied armies, and turned the Germans back. _17._ The United States sent more than two million men in all overseas. _18._ The peace treaty changed many boundary lines. _19._ Americans wished to uphold world peace, but in the election of 1920 defeated the League of Nations as it stood.