In 1803, the United States purchased the Louisiana Territory from France for $15 million, effectively doubling the size of the country. The acquisition, negotiated by President Thomas Jefferson, encompassed over 828,000 square miles of land west of the Mississippi River. The purchase opened vast new territories for settlement and exploration, fueling the idea of 'Manifest Destiny.' It was one of the largest land purchases in history and set the stage for the nation's westward expansion throughout the 19th century.

The Louisiana Purchase is a monumental event in American literature, symbolizing the nation's boundless potential and its drive to explore and settle the continent. It is the backdrop for the epic poetry of Walt Whitman and the frontier narratives of James Fenimore Cooper. The purchase opened up the American West as a subject for literature, inspiring tales of adventure, exploration, and the complex encounters between settlers and Native Americans.