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Global approaches to health began to be conceived as rich nations embarked on the exploration and colonization of poor nations in the tropics. For much of the first half of the 20th century, these approaches were focused on gaining an understanding of the pathophysiology of infectious diseases endemic to warmer climates and devising the means to cure them. In the latter half of the 20th century, the use of airplanes increased international travel, allowing the import and export of various infectious agents with increasing ease. Other factors contributing to the spread of disease were the mass migrations caused by war,
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