The Arroyo Hondo and the Calcasieu River (unconnected) were the eastern border, with the Sabine River serving as the western border. The southern border was undoubtedly the Gulf of Mexico, and one can assume that the northern border was the parallel of thirty seconds, approximately.  It included parts of the present-day communities of La Soto, Sabine, Natchitoches, Vernon, Rapides, Beauregard, Allen, Calcasieu, Jefferson Davis and Cameron.  “Neutral ground” as a true noun and toponym (name of place) entered the Louisiana lexicon in 1806, a year before the creation of Canal Street, thanks to a military resolution on a persistent imperial disagreement over present-day southwestern Louisiana. Spanish settlers in Mexico had viewed the country roughly, between the Sabine and Calcasieu rivers, as the easternmost border of Spain, while the French authorities of the Mississippi Valley considered it to be the westernmost area of their Louisiana. But neither side wanted to go to war because of the dispute. To avoid further armed clashes, U.S. General James Wilkinson and Spanish Lieutenant-Colonel Simin de Herrera, the region`s two military commanders, signed an agreement that made the disputed area neutral ground (November 5, 1806), until the border could be set by the respective governments. The agreement was not a treaty and was not ratified by either government, although it was widely respected. Even with this agreement, the boundaries of neutral soil have not been fully defined. The Neutral Neighborhood (also known as the “Neutral Strip,” “Neutral Territory,” and Louisiana`s No Man Country; sometimes anachronistically called Sabine Free State) was a controversial area between Spanish Texas and newly acquired Louisiana Purchase of the United States. Local officers from Spain and the United States agreed to temporarily leave the neutral Enzis outside the jurisdiction of one of the two countries. The area, now in western Louisiana, had a neutral status from 1806 to 1821 October 1800 Louisiana was officially returned to France, although the Spaniards continued to manage it.
The provisions of the treaty did not contain information on the boundaries of the area to be returned. Rumors of the treaty reached U.S. President Thomas Jefferson, who tried to buy land at the mouth of the Mississippi River to secure U.S. access to the Gulf of Mexico. Jefferson discovered that Napoleon was willing to sell the whole territory to finance his wars in Europe. France took formal control of Louisiana from Spain on November 30, 1803 and handed New Orleans over to the United States on December 20, 1803. The United States recaptured the rest of the territory on March 10, 1804. Louisiana Purchase doubled the size of the United States and opened the expansion of the United States west to the Pacific Ocean and the Gulf Coast.