While North America, Central and South America are all part of the western hemisphere, they historically have significant differences. In North America at least in what is now Canada and the US there were about 17 million indigenous people when the Europeans arrived. On the Great Plains and in northern what is now Canada they mostly had a nomadic existence, following the game like the buffalo. In what is now Mexico, and what is now Guatemala and Honduras, the Aztecs and Toltecs built large cities with temples and had sedentary well organized agricultural societies and relatively large populations. This was also the case with the Incas and their cities in the western part of South America.
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They made operations more technical because users had to program their own computers.
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The Cold War was characterised by the tension between the two contending superpowers the United States and the Soviet Union. Yet the position of Communist China under Mao Zedong in the Cold War, in many respects, was not minor but of great importance especially with regards to its relationship with the Soviet Union.
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