Mississippian By cmsjmathis18 Period: Jan 1, 1000 to Jan 1, 1600 Mississippian Lasted as long as 358 to 323 million years. These people were experts in building things. May 21, 1542 Hernando De Soto He was 14 years old when he started exploring.Him and his men traveled 4,000 miles across the region.