• the monroe doctrine

    sought to isolate the america continents from European influences and problems. american was isolationist
  • Period: to

    the first world war

    war involving nearly all the nations of the world
  • blockades

    german told americans to stay off british ships, and they could and would sink them.
  • unlimited submarine warfare

    Germany announced unlimited submarines warfare in war zone
  • russia

    Russia left the war after its communist revolution tussias withdrawal allowed Germany to fight a one front war with all its troops concentrated on France