This document provides an overview of the causes of World War 1. It discusses both long-term causes like the arms race, territorial disputes between countries, and the formation of military alliances, as well as short-term causes like the assassination of Archduke Franz Ferdinand which directly led to Austria-Hungary declaring war on Serbia and starting a chain reaction that engulfed Europe in war. The document also summarizes some key events of the war like the entry of the US in 1917 and Russia leaving the war, as well as the Treaty of Versailles that ended the war and placed blame and reparations on Germany.