Gallatin disliked living in New England, instead preferring to become a farmer in the Trans-Appalachian West, which at that point was the frontier of American settlement. He became the interpreter and business partner of a French land speculator, Jean Savary, and traveled throughout various parts of the United States in order to purchase undeveloped Western lands. In 1785, he became an American citizen after he swore allegiance to the state of Virginia. Gallatin inherited a significant sum of money the following year, and he used that money to purchase a 400-acre plot of land in Fayette County, Pennsylvania. He built a stone house named Friendship Hill on the new property. Gallatin co-founded a company designed to attract Swiss settlers to the United States, but the company proved unable to attract many settlers.