The Louisiana Purchase Treaty was signed in Paris France on April 30, 1803. Robert Livingston and James Monroe signed the treaty on behalf of the United States and Barbé Marbois signed it on behalf of France.
President Jefferson announced the treaty to the American people on July 4 and the United States Senate ratified the treaty on October 20 by a vote of 24 yeas and 7 nays.
On October 31 Congress made temporary provisions for local civil government to continue as it had under French and Spanish rule and authorized the President to use military forces to maintain order. President Jefferson then authorized taking possession of the territory and establishing a temporary military government.