Barbara Tuchman wrote a book on the Zimmerman Telegram. Quite good.<p><a href="https://www.amazon.com/Zimmermann-Telegram-Barbara-W-Tuchman/dp/0345324250/ref=asc_df_0345324250" rel="nofollow">https://www.amazon.com/Zimmermann-Telegram-Barbara-W-Tuchman...</a>