led an expedition into the area in the early 1540s, he encountered several native groups now thought to have been Caddoan. Composed of many tribes, the Caddo were organized into three confederacies, the Hasinai, Kadohadacho, and Natchitoches, which were all linked by their similar languages. Plaquemine Mississippian The Plaquemine culture was an archaeological culture in the lower Mississippi River Valley in western Mississippi and eastern Louisiana. Good examples of this culture are the Medora site (the type site for the culture and period) in West Baton Rouge Parish, Louisiana, and the Anna, Emerald Mound, Winterville and Holly Bluff sites located in Mississippi. Plaquemine culture was contemporaneous with the Middle Mississippian culture at the Cahokia site near St. Louis, Missouri. It is considered ancestral to the Natchez and Taensa Peoples. Emerald Mound: A Plaquemine Mississippian period archaeological site located on the Natchez Trace Parkway near Stanton, Mississippi. The site dates from the period between 1200 and 1730. The platform mound is the second-largest Pre-Columbian earthwork in the country, after Monks Mound at Cahokia. Grand Village of the Natchez: The main village of the Natchez people, with three mounds. The only mound site to be used and maintained into historic times. Known Mississippian settlements Although the Mississippian culture was heavily disrupted before a complete understanding of the political landscape was written down, many Mississippian political bodies were documented and others have been discovered by research. Related modern nations Mississippian peoples were almost certainly ancestral to the majority of the American Indian nations living in this region in the historic era. The historic and modern day American Indian nations believed to have descended from the overarching Mississippian culture include: the Alabama, Apalachee, Caddo, Chickasaw, Catawba, Choctaw, Muscogee Creek, Guale, Hitchiti, Ho-Chunk, Houma, Kansa, Missouria, Mobilian, Natchez, Osage, Quapaw, Seminole, Tunica-Biloxi, Yamasee, and Yuchi. Contact with Europeans Scholars have studied the records of Hernando de Soto's expedition of 1539–1543 to learn of his contacts with Mississippians, as he traveled through their villages of the Southeast. He visited many villages, in some cases staying for a month or longer. The list of sites and peoples visited by the Hernando de Soto Expedition chronicles those villages. Some encounters were violent, while others were relatively peaceful. In some cases, de Soto seems to have been used as a tool or ally in long-standing native feuds. In one example, de Soto negotiated a truce between the Pacaha and