As people find it easier to interact across geographical space, they can more easily visualize other people as belonging to their own familiar worlds. The more easily they communicate with each other, the more likely they are to seek and find a common language. The more they travel to each other’s lands and settle in each other’s territories, the more likely they are to adopt each other’s customs and traditions. Over time, they become more likely to eat the same foods, wear the same clothes, and even observe the same holidays. They become more likely to intermarry, and to produce children that
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