Trade along the Eastern African coast started as early as the first century CE. Bantu farmers, who are considered the initial settlers within the region, built communities along the coast. These farmers eventually started trading with traders from southeast Asia, southern Arabia, and sometimes Rome and Greece (Berger et al. 362). The rise of the Swahili coast city-states can be largely attributed to the region's extensive participation in a trade network that spanned the Indian Ocean. The Indian Ocean's trade network has been likened to that of the Silk Road, with many destinations being linked through trade. It has been noted that the Indian Ocean trade network actually connected more people than the Silk Road's. The Swahili coast largely exported raw products like timber, ivory, animal skins, spices, and gold. Finished products were imported from as far as east Asia such as silk and porcelain from China, spices and cotton from India, and black pepper from Sri Lanka. Some of the other imports received from Asia and Europe include cottons, silks, woolens, glass and stone beads, metal wire, jewelry, sandalwood, cosmetics, fragrances, kohl, rice, spices, coffee, tea, other foods and flavorings, teak, iron and brass fittings, sailcloth, pottery, porcelain, silver, brass, glass, paper, paints, ink, carved wood, books, carved chests, arms, ammunition, gunpowder, swords and daggers, gold, silver, brass, bronze, religious specialists, and craftsmen. Other places that traded with the Swahili coast include Egypt, Greece, Rome, Assyria, Sumeria, Phoenicia, Arabia, and Persia. Trade in the region decreased during the Pax Mongolica due to overland trade being cheaper during that period, however, trade by ships provided the advantage that the goods that were transported on them were in bulk, meaning they could be available to the mass market. Many different ethnic groups were involved in the Indian Ocean's trade network, however, especially in the western part of the Indian Ocean, Swahili coast being included, muslim merchants dominated the trade because they had the money to build ships. The yearly monsoon winds carried ships from the Swahili coast to the eastern Indian Ocean and back. These yearly winds were the catalyst for trade in the region as they reduced the risk associated with sailing and made it predictable. The monsoon winds were less strong and reliable as one travelled further South along Africa's coast resulting in settlements being smaller and less frequent towards the South. Trade was further encouraged by the invention of lateen sails which allowed merchants to travel apart from the monsoon winds. Evidence for Indian Ocean trade includes the presence of pot sherds on coastal archaeological sites that can be traced back to China and India.