The port town of H?i An and its bridge during the 18th century. Watercolour engraving by Jacques Chereau (1688-1776), circa 1750. H?i An's great importance waned sharply at the end of the 18th century because of the collapse of Nguy?n rule, which resulted within the Tây S?n Rebellion - which was against overseas trade.?? bi?t thêm thông tin và