In what year did the First World War end?

1918 is correct because the fighting in World War I ended with the Armistice of Compiègne on November 11, 1918, halting hostilities between the Allies and Germany. While the formal peace (Treaty of Versailles) came in 1919, the war effectively ended in 1918 when the guns fell silent. Context: After years of trench stalemate, the 1918 Allied Hundred Days Offensive, combined with the entry of the United States and the collapse of the Central Powers, forced Germany to seek an armistice. To remember the date, think “the 11th hour of the 11th day of the 11th month”—1918—now commemorated as Armistice Day or Remembrance Day in many countries.