At the turn of the century, by the secret Treaty of San Ildefonso, Spain ceded Louisiana back to France on October l, 1800. The two countries kept the treaty a secret until Napoleon could organize a military expedition to protect the Louisiana Territory from American or British invasion.
Abstracts of Civil Records of St. Charles Parish, 1700-1803, Glenn Conrad Entry No. 1887, dated June 9, 1803, verify the passage of the treaty:
Notice Published by order of the Governor General and the Marquis de Casa Calvo regarding the cession of Louisiana to the French Republic (Printed Document). The document is dated in New Orleans, May 18, 1803.