World War I

How did World War 1 begin? Who were the Allies and what countries made up the Central Powers? Let's find out.

This is a timeline of events during the second half of World War I, from 1916 to 1919. From the devastating Battle of the Somme to the introduction of U-boats and the eventual signing of the Treaty of Versailles, this period witnesses significant battles, shifting alliances, and the profound impact of the war on nations and their people.

This is a timeline of the first half of World War I, from 1882 to 1916, as alliances form, assassinations spark conflicts, and trench warfare becomes the norm. From the assassination of Archduke Franz Ferdinand and the brutal warfare on the Western Front, this war becomes a deadly struggle that shapes the course of history.

The sinking of the RMS Lusitania by a German U-boat in 1915, and the United States’ firm response, demonstrated America's readiness to end its isolationism to defend innocent lives.