Question: When was the county seat and only city of Adams County, Mississippi formed into a trading post?

Context paragraphs:
Corning, Iowa: Corning is a city in Quincy Township, Adams County, Iowa, United States.  The population was 1,635 at the 2010 census.  It is the county seat of Adams County.  Corning is located just North of the intersection of US Highway 34 and Iowa Highway 148.

Decatur, Indiana: Decatur is a city in Root and Washington townships, Adams County, Indiana, United States.  It is the county seat of Adams County.  Decatur is home to Adams Memorial Hospital, which was designated as one of the "Top 100" Critical Access Hospitals in the United States.  The population of Decatur was 9,405 at the 2010 census.

Natchez, Mississippi: Natchez is the county seat and only city of Adams County, Mississippi, United States.  Natchez has a total population of 15,792 (as of the 2010 census).  Located on the Mississippi River across from Vidalia in Concordia Parish, Louisiana, Natchez was a prominent city in the antebellum years, a center of cotton planters and Mississippi River trade.

Adams County Courthouse (Iowa): The Adams County Courthouse is located in Corning, Iowa, United States.  Quincy was Adams County's first county seat, and a frame building was built for a courthouse in the 1850s.  Corning became the county seat in 1872, and a frame building was built there for the courthouse.  It was replaced by a brick Romanesque Revival structure in 1890.  It was similar to the Adair County Courthouse and the Monona County Courthouse.  The present Modernist courthouse was completed in 1955 for $218,635.

Ritzville, Washington: Ritzville is a city in Adams County, Washington, United States.  The population was 1,673 at the 2010 census.  It is the county seat of Adams County.  The city is part of the Othello, WA Micropolitan Area, which comprises all of Adams County, and is part of the larger Moses Lake-Othello, WA Combined Statistical Area.

Adams County Courthouse (Illinois): The Adams County Courthouse is a government building in central Quincy, the county seat of Adams County, Illinois, United States.  Built in 1950 after a tornado destroyed its predecessor, it is the fourth building to serve as a courthouse for Adams County.

Adams County Courthouse (Indiana): Adams County Courthouse is located in the city of Decatur, the county seat of Adams County, Indiana.  It was built in 1872–1873 at a cost of $78,979.  The designer was J. C. Johnson, who had been trained as a carpenter and joiner and became a self-taught architect; he won second place in the Indiana State Capitol design competition.

Kræmmerholmen: Kræmmerholmen is an old trading post on the island of Fedje.  The trading post is now in the village of Fedje which is the main village on the island of Fedje in the municipality of Fedje, Hordaland county, Norway.  The main building of Kræmmerholmen was moved to this location in about 1652.  During the 18th century, Fedje was an important trading place, with the small island Kræmmerholmen being the location where the trading took place.  In 1702, merchants who were citizens of Bergen were granted permission to set up a trader's inshore channel.  Trade was managed by a merchant's ablest foreman.  Christopher Kahrs, one of the richest merchants in Bergen, purchased Kræmmerholmen in 1799.  In addition to the actual trading post, he also owned all of the island of Fedje, including tenant farms and all the dwelling houses.

Jack Rabbit Trading Post: The Jack Rabbit Trading Post is a convenience store and curio shop located on former U.S. Route 66, five miles west of Joseph City, Arizona city limits off of Exit 269 on Interstate 40.  The trading post hails from Route 66's glory days, and is currently in operation.  With a large fiberglass jackrabbit that can be mounted (for pictures), the facility is considered a major Route 66 attraction by enthusiasts.  It was famous for numerous billboards up and down US 66 (and in some other locations) which had the silhouette of a jackrabbit and the distance from that sign to the trading post.  In front of the store was another such billboard with "HERE IT IS" written underneath it.  Jack Rabbit is owned by the Jaquez family.

Louis Poncereau de Chavagne de Richebourg: Louis Poncereau de Chavagne de Richebourg was an officer in the early French colony of Louisiana.  He arrived there in 1713 and held the rank of captain in the Compagnies Franches de la Marine.  He helped to found a new trading post and fort at Natchez, Mississippi in 1716, and fought in the first of a series of conflicts between the French and the Natchez people.  He recorded his experiences in a manuscript entitled "Mémoire sur la première guerre des Natchez."  He subsequently served in the French capture of Pensacola, Florida during the War of the Quadruple Alliance in 1719.  According to the narrative by Dumont de Montigny, he was appointed to command a ship carrying Spanish prisoners to Havana, Cuba for ransom, only to be taken prisoner himself.  Spanish forces then expropriated the vessel and returned to Pensacola, entering the harbor flying French colors and pretending to be under the command of Richebourg.  After being ransomed from the Spanish at the end of the war, Richebourg was subsequently appointed royal lieutenant at the newly founded city of New Orleans in 1722, but sailed back to France that same year.

Supporting paragraphs: Louis Poncereau de Chavagne de Richebourg Natchez, Mississippi
Answer: 1716