1803 originally what did the u.s. what to purchase
By Martin Kelly. The Louisiana Purchase was one of the largest land deals in history. In 1803, the United States paid approximately $15 million dollars for over 800,000 square miles of land.y Martin Kelly. The Louisiana Purchase was one of the largest land deals in history. In 1803, the United States paid approximately $15 million dollars for over 800,000 square miles of land.