 Complete the following phrase:  The fort felt into decline sometime after the French and Indian War 17541763. During this time, the area in which Fort de Cavagnial came under the power of Spain, although French soldiers remained at the site of the fort until 1764, when Pierre-Joseph Neyon de Villiers acting on behalf of Jean-Jacques Blaise dAbbadie, the director-general of the Colony of Louisiana ordered that the troops stationed in the area to throw down the outpost and retreat to New Orleans. Evidently, the site was not completely razed, for in 1804, Meriwether Lewis and William Clark stumbled across the old site during their 