Descendants of the American Indians arrived in North America perhaps 10,000 years ago from Asia. By 1500, there were some 1.5 million of them in North America. They were divided into hundreds of tribes, spoke many different languages, and kept no written records.
The Cold War with the Soviet Union continued with confrontations in Berlin and in Cuba. But gradually attention shifted to crises brought on by smaller countries, such as the oil crisis brought on by Arab nations in the Middle East and the painful hostage crisis in Iran.