no
The Titanic
unrestricted submarine warfare
Hitler's dog pooped on his lawn.
Germany's unrestricted submarine warfare
They did not lead to war; they were part of the war. They were, however, factors in the United States' decision to enter the war.
The United States would not make a decision to enter war unless there was a benefit to be gained...That being said, aiding in WWII was morally responsible
it sunk by a torpedo from U-20, a submarine
Depends on your point of veiw
Public opinion following news of the Zimmerman telegraph.
Germany's unrestricted submarine warfare
The Irish-Americans possibly did not like Great Britain
Persia did NOT fight in World War 1.