Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Gusuku Sites and Related Properties of the Kingdom of Ryukyu' has mentioned 'Trade' in the following places:
Occurrence Sentence Text Source
Trade became more developed and persuaded the aji to gain possession of good harbors like Naha, Yomitan, Itoman, Katsuren, Sashiki, and Unten.