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lands, and developing distinct cultures in relative isolation. Early explorers settled in Europe and Asia; about 14,000 years ago, some crossed the Ice Age land bridge from Siberia to Alaska, and moved southwards to settle in the Americas. For the most part, these cultures were ignorant of each other's existence. The second period of exploration, occurring over the last 10,000 years, saw increased cross-cultural exchange through trade and exploration, and marked a new era of cultural intermingling,

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