How did Swahili help East African trade?

Swahili city-states also manufactured goods for both their own residents and for trade such as pottery, cloth, and highly decorated siwa, the typical brass trumpet of the region. Goods from Africa included: Precious metals - gold, iron, and copper. Ivory.

Explanation:

answer; (c) a law code that provides believers with a set of pratical laws to regulate their daily lives

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.