<P> The Louisiana Purchase Treaty was signed on 30 April by Robert Livingston , James Monroe , and Barbé Marbois in Paris . Jefferson announced the treaty to the American people on July 4 . After the signing of the Louisiana Purchase agreement in 1803 , Livingston made this famous statement , `` We have lived long , but this is the noblest work of our whole lives ... From this day the United States take their place among the powers of the first rank . '' </P>
where was the louisiana purchase signed in 1803
Paris