Between the end of the Clovis culture and the rise of the Mississippian civilization, North America experienced profound shifts in both environment and human society. As the Ice Age came to an end and megafauna disappeared, early inhabitants adapted by expanding their diets and foraging for smaller game, plants, and fish. Over millennia, these nomadic bands evolved into more sedentary communities, spurred by innovations like the domestication of crops and the development of pottery. Cultures such as the Adena and Hopewell introduced ceremonial mound-building and established vast trade networks across the continent, connecting distant regions. By 800 CE, this steady progression toward more complex societies culminated in the rise of the Mississippian culture, known for its monumental earthworks, centralized chiefdoms, and reliance on maize agriculture. This period of transition set the stage for the formation of advanced civilizations in North America, long before European contact.