Answer:
World War 1, also known as the Great War, began on July 28th, 1914 and ended on November 11th, 1918.
During the war, the Central Powers, led by Germany, Austria-Hungary, and the Ottoman Empire, fought against the Allied Powers, led by France, Russia, and the United Kingdom. The United States later joined the Allies after the sinking of the RMS Lusitania by German U-boat in 1915.
The war was sparked by the assassination of Archduke Franz Ferdinand of Austria and his wife, Sophie, in Sarajevo, Bosnia on June 28th, 1914. The assassination led to a chain of events, including alliances between countries and declarations of war, that quickly escalated into a global conflict.
The war was marked by trench warfare and heavy loss of life, as well as new technological developments such as tanks, submarines, and chemical weapons. The war also saw the introduction of total warfare, with countries mobilizing their entire populations and economies for the war effort.
The war ended with the defeat of the Central Powers and the signing of the Treaty of Versailles on June 28th, 1919. The treaty led to the breakup of the Austro-Hungarian Empire, the displacement of millions of people, and the creation of new countries in Europe. The war also had a profound impact on the world, leading to the Russian Revolution, the rise of fascism in Italy, and the eventual outbreak of World War II.