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Mining and metalworking were the first specialized industries, and the invention of the wheel during this time revolutionized transport.
Agricultural productivity (which began during the New Stone Age, or Neolithic period, about 6000 BC) was transformed by the ox-drawn plough, increasing the size of the population that could be supported by farming.
In some areas, including most of Africa, there was no Bronze Age, and ironworking was introduced directly into the Stone Age economy.
Green, red, and blue were the colours of the Eritrean People's Liberation Front (EPLF) flag which bore a yellow star at the hoist. Effective date: late 1995.
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