World War I began after the assassination of Archduke Franz Ferdinand led Austria-Hungary to declare war on Serbia. This caused countries to take sides and enter the war through a series of alliances, with the Central Powers of Germany, Austria-Hungary and the Ottoman Empire fighting against the Allied Powers including Britain, France, Russia and later the United States. Major battles included the Battle of the Marne in 1914 where Germany failed to capture Paris, and the Battle of the Somme in 1916 which was the bloodiest day for Britain. The United States entered the war in 1917 after German U-boats attacked American ships, and launched a major offensive in 1918 that helped turn the tide in favor of the Allies

1. World War I The Domino Effect that led to the War, the Largest Battles, the entrance of the United States, and the Fourteen Points

6. Map detailing the Allied Powers and Central Powers entering the War in 1914

9. German Battle Plan- The Schlieffen Plan

10. Battle of Marne, France

13. 6,000 miles of Trench lines span the Northeastern border of France

16. Battle of Somme, France