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When the British intercepted the Zimmerman telegram, it was revealed that:
1. Germany planned to declare unrestricted submarine warfare and attack all ships, regardless of nationality.
2. Germany wanted Mexico as an ally in exchange for help in recovering Texas, New Mexico, and Arizona from the United States.
These revelations played a significant role in shaping diplomatic relations and decisions during World War I. The Zimmerman telegram's contents influenced public opinion and contributed to the United States entering the war against Germany.