Westward expansion began in earnest in 1803. Thomas Jefferson negotiated a treaty with France in which the United States paid France $15 million for the Louisiana Territory – 828,000 square miles of land west of the Mississippi River – effectively doubling the size of the young nation.
The settlers became successful farmers and built housing and factories. Unfortunately, the Native Americans lost their land and had to live on small reservations. In conclusion, the Westward Expansion led to America becoming a superpower.