“Woodrow Wilson Urges Congress to Declare War on Germany” http://en.wikisource.org/wiki/Woodrow_Wilson_Urges_Congress_to_Declare_War_on_Germany
“Zimmerman Telegram” http://en.wikisource.org/wiki/Zimmermann_Telegram
“Zimmerman Telegram” http://en.wikisource.org/wiki/Zimmermann_Telegram