The Causes of World War I
World War I began in 1914 when Archduke Franz Ferdinand of Austria-Hungary was assassinated by a Serbian nationalist.
After this, Austria-Hungary declared war on Serbia.
This conflict began to escalate because of the many alliances in Europe at the time.
Germany supported Austria-Hungary in the conflict, and Russia sided with Serbia.
Russia was also part of a larger alliance known as the Triple Entente, which included France and Britain.
Eventually, more countries began to join the war.
This war was different from previous wars because of new technology such as machine guns, tanks, and airplanes.
World War I lasted until November 1918, when both sides signed an armistice.