The port town of H?i An and its bridge from 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 from your Tây S?n Rebellion - which was against international trade.Thg 1Thg 2Thg 3Thg 4Thg 5Th