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In page Trade:

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Materials used for making jewelry were traded with Egypt from 3000 BCE.[citation needed] Long-range trade routes first appeared in the 3rd millennium BCE, when Sumerians in Mesopotamia traded with the Harappan civilization of the Indus Valley.[5] The Phoenicians were noted maritime traders, traveling across the Mediterranean Sea and as far north as Britain for sources of tin to manufacture bronze. For this purpose they established trading colonies — which the Greeks called emporia.[6] Along the coasts of the Mediterranean, researchers have found a positive relationship between how well-connected a coastal location was and the local prevalence of archaeological sites from the Iron Age. This suggests that a location's trade potential was an important determinant of human settlements.[7]