Answer:
The Zimmerman telegram clearly helped draw the United States into the war and thus changed the course of history. This primary source comes from the General Records of the Department of State.
The note revealed a plan to renew unrestricted submarine warfare and to form an alliance with Mexico and Japan if the United States declared war on Germany. The message was intercepted by the British and passed on to the United States; its publication caused outrage and contributed to the U.S. entry into World War I.
Heinrich von Eckardt
On January 16, 1917, British code breakers intercepted an encrypted message from Zimmermann intended for Heinrich von Eckardt, the German ambassador to Mexico.
Explanation:
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