1917 The Greek Government accepts reparations for Allied losses sustained in recent actions in Greece
1917 "Zimmermann Telegram" is sent from Germany to Mexico, stating in the event of the US entering World War I on the allied side, Mexico would be given Texas, Arizona and New Mexico. Intercepted by British intelligence and partially deciphered by the next day. It's release in March shifts US public opinion in favor of war against Germany.
1918 Austria and Germany are disrupted by strikes as people express impatience with leaders continuing the war
1919 Prohibition ratified by 3/4 of US states; Nebraska is 36th
1920 1st assembly of the League of Nations is held in Paris