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Hinduism, Buddhism, and Jainism spread across the Bay of Bengal to Southeast Asia.
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Mariners began to sail across the Arabian Sea in open water due to the discovery of the seasonal monsoon winds and ability to navigate with the stars.
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Also during the third and second century BCE, Austronesian mariner sailed toward the West. They reached India, and settled on the East African island of Madagascar.
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Sugar cane was introduced to India from Southeast Asia.
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Brought from Southeast Asia, Bananas were also introduced to India and Africa during this time.
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Trade in the Indian Ocean became clear along with more written records and artifacts.
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Long-distance trade expands greatly.
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Trade between Egypt and Mesopotamia declined due to long-distance trade.
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Persians begin to migrate from Iran to Asia
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Iron and silk was traded into India from China.
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The Greek coin was introduced.
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Arriving from the Gulf of Aden from the monsoon winds.
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Saddles were created and began use.
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Sent there by the Persian ruler Darius I, Greek and Roman sailors and traders entered the Indian Ocean
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Sent by Alexander the Great, Nearchus explored the Indus to the Arabian Gulf. Other Greeks also sailed to India and around the Arabian Peninsula to Oman
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Apart of the price trade, Romans used peppercorns, an important spice, in place of currency and other valuable goods.
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In the first century CE, the Periplus of the Erythrean Sea named many ports, lands, and goods in the Indian Ocean, including information about the east coast of Africa and of India.
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Goods from China and Southeast Asia began to be kept on record of trade with India during this time
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India exported many goods, and imported silver, copper, and gold.
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During the third and second centuries BCE, Indian and Arab ships are known to have sailed directly from Southern Arabia to the Malabar coast of India and back.