The United States Senate agrees to purchase Louisiana.

With the Louisiana Purchase in October 20,1803, the United States purchased approximately 828,000,000 square miles of territory from France, thereby doubling the size of the young republic. What was known as Louisiana Territory stretched from the Mississippi River in the east to the Rocky Mountains in the west and from the Gulf of Mexico in the south to the Canadian border in the north. Part or all of 15 states were eventually created from the land deal, which is considered one of the most important achievements of Thomas Jefferson’s presidency.

The acquisition of the Louisiana Territory for the bargain price of less than three cents an acre was among Jefferson’s most notable achievements as president. American expansion westward into the new lands began immediately, and in 1804 a territorial government was established. On April 30, 1812, exactly nine years after the Louisiana Purchase agreement was made, the first state to be carved from the territory Louisiana was admitted into the Union as the 18th U.S. state.