In 1725, the "Chemin du Roy" (French for "King's Highway") was built connecting it with Louiseville and Pointe-du-Lac. In 1764, the West Grosbois Seignory was purchased by Conrad Gugy, thereby becoming the first French-Canadian Seignory in English possession. Between 1765 and 1790, Yamachiche grew quickly with new settlers from Acadia (Acadians expelled by the English) and from the United States, particularly Loyalists from Massachusetts.