Yes, we believe that Thomas Jefferson did abandon his ideals by making the Louisiana Purchase because he believed in the least amount of purchases made by the government as possible. He was big on small farming communities, and states' rights and was against large government purchases because it gave the government too much power.
He wanted the nation's capitol to be a small city with only a few thousand people in it.
He wanted to avoid ambitious measures and is quoted, "We will be less ambitious." He wanted to keep things simple and not take unnecessary risks.
He wanted to keep the federal establishment as plain and simple as possible. This meaning that he wanted