was the purchase of the French province of Louisiana by the United States in 1803. The province stretched from the Mississippi River westward to the Rocky Mountains and from the Gulf of Mexico northward to Canada, covering an area equal to that of the United States, prior to the purchase. Except for the Mississippi River on the east and Canada on the north, the boundaries were indefinite. The United States also claimed West Florida between the Mississippi and Perdido rivers as part of the purchase, but Spain denied the claim. As a result of t ....