The Louisiana Purchase was the acquisition by the United States of more than 529,911,681 acres of territory from France in 1803, at the cost of $15 million or about $353 per acre. This beautiful proof silver crown was issued by France to commemorate the 200th anniversary of the event. The coin comes in its Monnaie de Paris issued presentation case with accompanying Certificate of Authenticity. This would be a great addition to any collection of world coins.