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Since the 19th century, war has been the driving force for the development of mass media. At that time, society was still in an unstable state, and the world pattern was not completely determined. Therefore, the relationship between various countries and the world’s need for communication is very urgent. In other words, gaining time is equal to half succeeding. In the dissemination of the steam age, the timeliness of information is far less efficient than that of telegrams, newspapers and telephones. The appearance of the telegraph is definitely an important invention that rewrites history and provides a more efficient way and opportunity to connect with the world. In the steam age, a message that can be delivered in half a month or a month, telegram only takes a few minutes. This progress in timeliness has greatly increased the frequent interaction between countries. In addition, this technological advancement not only promotes the development of social fast reading, but also provides new professions-typists and deciphers for various countries. Because these technologies are used in wars and are critical to victory, countries around the world have further promoted the development of the media in order to capture secret documents and news of other countries, and also invented cryptographic machines to obtain intelligence from other countries. And protect the intelligence of your own country. For example, in the Pacific War, Japan first annihilated the American aircraft carrier. Later, the U.S. deciphering team deciphered and inferred the Japanese military’s telegram. Finally, the U.S. military set up an ambush to wait for work. It defeated the Japanese navy on June 3, 1942. The cost of losing an aircraft carrier sank four major Japanese aircraft carriers and more than 300 aircraft, completely reversing the situation in the Pacific battlefield. It can be said that technological progress has changed the situation of war. With the development of new media technology, countries are more closely connected. Ambassadors of various countries can send information to their own countries in the first time, and can grasp the dynamics and development of various countries in the first time. This is the new opportunity brought by timeliness. Especially in wars, it absolutely occupies a core role and can even change history.