On April 30, 1803, representatives of the United States and Napoleonic France conclude negotiations for the Louisiana Purchase, a massive land sale that doubles the size of the young American republic. What was known as Louisiana Territory comprised most of modern-day United States between the Mississippi and the Rocky Mountains, with the exceptions of Texas, parts of New Mexico, and other pockets of land already controlled by the United States. A formal treaty for the Louisiana Purchase, antedated to April 30, was signed two days later.
