The port city of H?i An and its bridge while in the 18th century. Watercolour engraving by Jacques Chereau (1688-1776), circa 1750. H?i An's relevance waned sharply at the end of the 18th century due to the collapse of Nguy?n rule, which resulted from your Tây S?n Rebellion - which was opposed to overseas trade.Administration map of Hoian City Hoi