World War 1 By bakasankey Jun 28, 1914 Assassination of Archduke Ferdinand [https://www.thoughtco.com/assassination-of-archduke-franz-ferdinand-1779218] Jul 30, 1914 Russia Mobilizes [https://causesofwwi.wordpress.com/russian-mobilization/] Aug 30, 1914 Battle of Tannenberg [https://www.worldatlas.com/articles/what-was-the-battle-of-tannenberg.html] Sep 6, 1914 The First Battle of Marne [https://www.ducksters.com/history/world_war_i/first_battle_of_the_marne.php] Feb 19, 1915 Battle of Gallipoli [https://www.smithsonianmag.com/history/new-view-battle-gallipoli-one-bloodiest-conflicts-world-war-i-180953975/] May 7, 1915 Lusitania Sinking [https://blogs.loc.gov/law/2015/05/the-sinking-of-the-lusitania/] May 23, 1915 Italy declares war on Austria-Hungary [https://www.mentalfloss.com/article/64322/wwi-centennial-italy-declares-war-austria-hungary] Jul 1, 1916 Battle of Somme [https://www.thesun.co.uk/news/2214575/who-won-battle-somme-date-end-people-died/] Aug 28, 1916 Japan declares war on Germany [https://www.history.com/this-day-in-history/japan-gives-ultimatum-to-germany] Jan 16, 1917 Zimmerman Telegram [https://www.historyguy.com/zimmerman_telegram.htm] Apr 6, 1917 United States declares war on Germany [https://history.state.gov/milestones/1914-1920/wwi] Jul 31, 1917 Battle of Passchendaele [http://www.bbc.co.uk/history/worldwars/wwone/battle_passchendaele.shtml] Nov 11, 1918 Armistice Day [https://www.southernliving.com/armistice-day] Jun 28, 1919 Treaty of Versailles [https://www.nationalgeographic.com/culture/topics/reference/treaty-versailles-ended-wwi-started-wwii/]
