• Serbia

    Serbia stared war to get back what was theirs.
  • assasination

    assasination
    Assasination of the Arch Duke Franz Ferdinand of Austria this triggeers the war. He was assasinated Gaverilo by Princip.
  • Austria and Hungary

    Austria ans Hungary declared war on Sirbia
  • Great Britian

    was an allianve with Germany. When Germany enetered the war so did Britin because Germany depended on Britian.
  • France

    The french wanted to take back what was theirs from Germany because the germans had taken two proviances fronm the french and defeated them in a battle in 1870. They formed an alliance against Germany and wanted went after them in 1914
  • Russia

    Russia was an alliance to france and helped them win a battle against Germany. so when the french joined the war their alliance Russian joined. russian had the biggest standing army of about 1,400,000 soilders with that they didnt have a problem joining the war.
  • Germany

    Germany was attacking american ships without warning until finally the united states declared war against them in 1914.
  • Belgium

    It was invaded by Germany on August 4th 1914. Belgium was nuetral didnt want to be in the war.
  • Ottoman Empire

    the ottoman empire first declared war on Romania because they declared war on Austrian-Hungary countries and Russian declared war on the Ottoman Empire becauase they bombarded Russian ports with ships.
  • Italy

    Italy joined the war on behalf of Britan, France and Russia. Italy had a triple alliance with these countries.
  • Bulgaria

    Bulgaria entered the war because Great Britain had declared war on them.
  • Portugal

    Portugal enterted WWI because Germany and Austria-Hungary declared war on them.
  • Romania

    Romania entered the war to seize back a peice of Hungary that contained a large romanian population.
  • Greece

    Greece joined the war because the french and British forced them to or Constanople would have been destroyed.