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At a press conference on March 3, 1917, he told an American journalist, "I cannot deny it. It is true." Then, on March 29, 1917, Zimmermann gave a speech in the Reichstag in which he admitted that the telegram was genuine. Since the public had been told falsely that the telegram had been stolen in a decoded form in Mexico, the message was at first widely believed to be an elaborate forgery created by British intelligence. Hall passed the telegram to the British Foreign Office on February 5 but still warned against releasing it. However, Germany could communicate wirelessly through the Telefunken plant, operating under Atlantic Communication Company in West Sayville, New York, where the telegram was relayed to the Mexican Consulate. That ensured that Mexican neutrality was the best outcome that the United States could hope for even if it allowed German companies to keep their operations in Mexico open.

Some of these names are retained even though different means of news acquisition are now used. Even if by some chance Mexico had the military means to win a conflict against the United States and to reclaim the territories in question, it would have had severe difficulty conquering and pacifying a large English-speaking population which had long enjoyed self-government and was better supplied with arms than were most other civilian populations. An optical telegraph is a telegraph consisting of a line of stations in towers or natural high points which signal to each other by means of shutters or paddles. Finally, since copies of the 13040 code text would also have been deposited in the records of the American commercial telegraph company, the British had the ability to prove the authenticity of the message to the American government. As a cover story, the British could publicly claim that their agents had stolen the telegram's decoded text in Mexico.

Meanwhile, the British discussed possible cover stories to explain to the Americans how they obtained the coded text of the telegram and to explain how they obtained the cleartext of the telegram without letting anyone know that the codes had been broken. Direct telegraph transmission of the telegram was impossible because the British had cut the German international cables at the outbreak of war. News of the telegram further inflamed tensions between the United States and Mexico. Zimmermann's office sent the telegram to the German embassy in the United States for retransmission to Eckardt in Mexico. It has traditionally been understood that the telegram was sent over three routes. The German Foreign Office refused to consider that their codes could have been broken but sent Eckardt on a witch hunt for a traitor in the embassy in Mexico. Wilson had refused to assign US Navy crews and guns to the merchant ships, but once the Zimmermann note was public, Wilson called for arming the merchant ships although antiwar members of the US Senate blocked his proposal. Why was the Zimmermann Telegram so important? Room 40 had obtained German cryptographic documents, including the diplomatic code 3512 (captured during the Mesopotamian campaign), which was a later updated code that was similar to but not really related to code 13040, and naval code SKM (Signalbuch der Kaiserlichen Marine), which was useless for decoding the Zimmermann Telegram but valuable to decode naval traffic, which had been retrieved from the wrecked cruiser SMS Magdeburg by the Russians, who passed it to the British.

Evidence the United States had been provided confidentially by the British informed Wilson that the message was genuine, but he could not make the evidence public without compromising the British codebreaking operation. The last commercial semaphore link ceased operation in Sweden in 1880. As of 1895, France still operated coastal commercial semaphore telegraph stations, what is control cable for ship-to-shore communication. By contrast the Confederacy failed to make effective use of the South's much smaller telegraph network. This could be as simple as a network of Ethernet Mac II's trying to talk to a LaserWriter that only connected to LocalTalk. With the purchase of NeXT and subsequent development of Mac OS X, AppleTalk was strictly a legacy system. This is the simplest and earliest configuration of an analog fly-by-wire flight control system. The control mechanisms in the cockpit now operate signal transducers, which in turn generate the appropriate electronic commands. CAN FD maintains backward compatibility with CAN 2.0 devices by using the same frame format as CAN 2.0B, with the addition of a new control field to indicate whether the frame is a CAN FD frame or a standard CAN 2.0 frame. Anticipating growing demand for an antivirus for a Smart TV, some security software companies are already working with partners in the digital TV field on the solution.