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The importance of geographic and topographic factors, along with limited means of communication and transportation, meant that separate geographic regions tended to develop unique military technologies. Such areas are called military ecospheres. The boundaries of a military ecosphere might be physical barriers, such as oceans or mountain ranges; they might also be changes in the military topography, that combination of terrain, vegetation, and man-made features that could render a particular technology or tactic effective or ineffective.Until the late 15th century CE, when advances in transportation technology broke down the barriers between them, the world contained a number of military ecospheres. The most clearly defined of these were based in Mesoamerica, Japan, India–Southeast Asia, China, and Europe. (In this context, Europe includes all of the Mediterranean basin and the watershed of the Tigris and Euphrates rivers.) With the appearance of the horse archer in late antiquity, the Eurasian Steppe became a well-defined military ecosphere as well.
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Those ecospheres with the most enduring impact on the technology of war were the European and Chinese. Though Japan possessed a distinctive, coherent, and effective military technology, it had little influence on developments elsewhere. India–Southeast Asia and Mesoamerica developed technologies that were well adapted to local conditions, but they were not particularly advanced. The Eurasian Steppe was a special case: usually serving as an avenue for a limited exchange of knowledge between Europe and China, in the late classical and medieval eras of Europe it developed an indigenous military technology based on the horse and composite recurved bow that challenged Europe and ultimately conquered China.Improved methods of transportation and warfare led to the eventual disappearance of the regional ecospheres and their absorption into the European ecosphere. This process began in the 12th century with the Mongol conquest of China and invasions of Europe, and it quickened and assumed a more pronounced European flavour in the 15th and 16th centuries with the development of oceangoing ships armed with gunpowder weapons.
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