Charleston was an incredibly important city in the South because of its location--it was located on a prime piece of coast line that made importing and exporting goods relatively fast and easy.
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while mesoamerican civilization knew of the wheel and basic metallurgy, the technologies became important. the earliest complex civilization was Olmec culture, which inhabited the gulf of mexico. (known for Olmec, Maya, Zapotec, Teotihuacan, Mixtec, and Mexica (or Aztec)
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As famous as Marco Polo is, he didn't invent anything. However, other inventions such as the compass and the boat influenced Polo. Marco Polo used the compass on all of his travels but especially to reach Asia.
The U.S.A., U.K., France, Cuba, China, Canada, and many many others.
The retail industry helps producers sell their goods to a national market.