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In 1500's the Indian Ocean trade declined when Portugal invade and wanted to benefit from this trading system to create profit.
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in 1500's the trading transportation that they used was overseas. They started to create boats to do tradings and over the years they continue working on creating more strong ships.
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During the early years they used a Kamal, which was their navigation key tool. It was made of a rectangular card attached to a knotted cord. The key helped sailors to find latitude sea which they will see the distance from horizon and particular stars during night time.
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Diseases also started to spread like smallpox, plague, influenza, cholera. This diseases existed in certain parts but they started to expand when trade and people movements started.
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Swahili started to grow by creating their own economic system which it was considered the biggest around the world.
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In this year the medical supplies started to expand in certain parts. Egypt and Iraq provided different medical advice's to Muslims.
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During this time trading started to expand through out the Indian Ocean with different types of goods.
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During this early years some of the goods that were being trade were: Sugar Cane, Cloves, Bananas, Silk, Mangrove Poles, Tortoise Shells, Ivory, Rhinoceros Horns, Camels, Cinnamon, Millet, Pearls, and Gemstones.
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Indian Ocean network started between Africa and Asia which help to expand more. Then it started to expand towards Kiwa, Sofala, Mombasa, Malindi, Great Zimbabwe who also traded with India, Southeast Asia and China.
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There was a lot of goods traded but the most required were cotton, silk, gold and jewelry. Asia and inland kingdoms were the ones importing this goods to East Africa or Eastern Coast Africa.
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From the Bay of Bengal to Southeast Asia the religions of Hinduism, Buddhism and Jainism spread.
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Dhows was a type of transportation that they used in the early years. They had smaller and large ships which where made of wood and two triangular sails.
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Scylax of Caryanda did his journey in the Indian Ocean to explore in orders of King Darius of Persian. The king had known that Indian had many of goods that will benefit him.
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Zhang Qian was and explorer and pioneer of the Silk Road trade routes. China was introduced to many Islands and cultures because of Zhang Qian who was sent by emperor Wudi.