#1T5 – 1881 15¢ American Rapid Telegraph Co. "Prepaid Telegram" Stamp - green, perf 12

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Telegraph Stamps – Document the Growth of America

The Zimmermann Telegram 

On February 24, 1917, British officials shared the Zimmermann Telegram with US President Woodrow Wilson, revealing a German plot to incite a war between the US and Mexico.

Since the start of World War I, Germany hoped to create a war between the US and Mexico to distract the US and slow the shipment of supplies to the Allies. The Germans had sent weapons and funds to arm the Mexicans, increasing tensions and provoking the Battle of Veracruz.

By early 1917, the Germans developed a new plot. On February 1, they planned to begin unrestricted submarine warfare, which would likely draw the US into the war. They sought to strike a deal with Mexico. If the US appeared close to entering the war, Mexico would declare war on the US, to keep them out of the Great War. If successful, Germany promised to help Mexico retake its lost territories: Texas, New Mexico, and Arizona.

Arthur Zimmermann sent the proposal by telegram on January 19, 1917. Because the British had cut Germany’s international cables at the start of the war, Germany sent their messages through US cables. President Wilson had agreed to this earlier in the war in the hopes it would aid in peace talks. The main condition was that the messages couldn’t be encoded. In this one instance, the Germans persuaded the US ambassador to allow them to encode their message.

In order for the telegram to reach Mexico, it was sent from the US Embassy in Berlin across the diplomatic cable to Copenhagen and then London, then through a relay station at the westernmost tip of England where the signal was boosted for the trans-oceanic jump. From there it would reach Washington, DC, for relay to the German ambassador in Mexico. All messages that passed through the British relay station were shared with British intelligence and decoded. So the day after the telegram was sent, they partially decoded the telegram and realized what the Germans were proposing.

The British knew that sharing the telegram could sway US public opinion against Germany. But they also knew the US might doubt its authenticity. They were also concerned that the US would discover the British had been reviewing messages on their cables and that the Germans would realize their code had been broken. As a result, they waited three weeks before taking any further action.

In the meantime, Germany began its unrestricted warfare on February 1 and the German ambassador in Mexico approached the Mexican president with the proposal. The president considered it and had a military commission assess the possibility. In the end, they believed it wasn’t possible or desirable for several reasons. Mexico was already embroiled in civil war, Germany’s promises of financial support were unreliable, and if they were able to take the territories, they would still face a large population of English-speaking people that were likely better armed.

On February 19, the British shared the telegram with an American secretary at the US Embassy in Britain. Once he was convinced it was real, he shared it with the US Ambassador the next day. The ambassador met with the British Foreign Minister on February 23 to go over the evidence of authenticity (the ciphertext and the German and English versions).

Then on February 24, the ambassador sent the message to President Wilson. Days later, on March 1, Wilson had the telegram published in the American press. Initially, many doubted its authenticity, but on March 3, Zimmermann announced at a press conference that it was in fact true. Public opinion quickly swayed against Germany and the US joined the war a month later. Historians consider the decryption of the telegram to be the most significant feat in British intelligence of the war.

Click here to read the decrypted telegram.

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Telegraph Stamps – Document the Growth of America

The Zimmermann Telegram 

On February 24, 1917, British officials shared the Zimmermann Telegram with US President Woodrow Wilson, revealing a German plot to incite a war between the US and Mexico.

Since the start of World War I, Germany hoped to create a war between the US and Mexico to distract the US and slow the shipment of supplies to the Allies. The Germans had sent weapons and funds to arm the Mexicans, increasing tensions and provoking the Battle of Veracruz.

By early 1917, the Germans developed a new plot. On February 1, they planned to begin unrestricted submarine warfare, which would likely draw the US into the war. They sought to strike a deal with Mexico. If the US appeared close to entering the war, Mexico would declare war on the US, to keep them out of the Great War. If successful, Germany promised to help Mexico retake its lost territories: Texas, New Mexico, and Arizona.

Arthur Zimmermann sent the proposal by telegram on January 19, 1917. Because the British had cut Germany’s international cables at the start of the war, Germany sent their messages through US cables. President Wilson had agreed to this earlier in the war in the hopes it would aid in peace talks. The main condition was that the messages couldn’t be encoded. In this one instance, the Germans persuaded the US ambassador to allow them to encode their message.

In order for the telegram to reach Mexico, it was sent from the US Embassy in Berlin across the diplomatic cable to Copenhagen and then London, then through a relay station at the westernmost tip of England where the signal was boosted for the trans-oceanic jump. From there it would reach Washington, DC, for relay to the German ambassador in Mexico. All messages that passed through the British relay station were shared with British intelligence and decoded. So the day after the telegram was sent, they partially decoded the telegram and realized what the Germans were proposing.

The British knew that sharing the telegram could sway US public opinion against Germany. But they also knew the US might doubt its authenticity. They were also concerned that the US would discover the British had been reviewing messages on their cables and that the Germans would realize their code had been broken. As a result, they waited three weeks before taking any further action.

In the meantime, Germany began its unrestricted warfare on February 1 and the German ambassador in Mexico approached the Mexican president with the proposal. The president considered it and had a military commission assess the possibility. In the end, they believed it wasn’t possible or desirable for several reasons. Mexico was already embroiled in civil war, Germany’s promises of financial support were unreliable, and if they were able to take the territories, they would still face a large population of English-speaking people that were likely better armed.

On February 19, the British shared the telegram with an American secretary at the US Embassy in Britain. Once he was convinced it was real, he shared it with the US Ambassador the next day. The ambassador met with the British Foreign Minister on February 23 to go over the evidence of authenticity (the ciphertext and the German and English versions).

Then on February 24, the ambassador sent the message to President Wilson. Days later, on March 1, Wilson had the telegram published in the American press. Initially, many doubted its authenticity, but on March 3, Zimmermann announced at a press conference that it was in fact true. Public opinion quickly swayed against Germany and the US joined the war a month later. Historians consider the decryption of the telegram to be the most significant feat in British intelligence of the war.

Click here to read the decrypted telegram.