World War I, also called the Great War, took place from 1914 to 1918 🌍. It involved many countries around the world. There were two main groups: the Allies, which included countries like Britain 🇬🇧, France 🇫🇷, and Russia 🇷🇺, and the Central Powers, which included Germany 🇩🇪, Austria-Hungary 🇦🇹, and the Ottoman Empire 🇹🇷. The war started after the assassination of Archduke Franz Ferdinand of Austria on June 28, 1914. This conflict changed how countries interacted with each other and led to important lessons on peace 🕊️.