The port town 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 great importance waned sharply at the conclusion of the 18th century as a result of collapse of Nguy?n rule, which resulted with the Tây S?n Rebellion - which was opposed to foreign trade.Remaining an ancient