Final answer:
The Mississippian Period saw an increase in settled agricultural communities and common cultural practices.
Step-by-step explanation:
The Mississippian Period saw an increase in two things - settled agricultural communities and common cultural practices. During this period, the Mississippian culture emerged as agriculturalists practicing large-scale, corn-based agriculture, which allowed them to support a dense population. This led to the appearance of large settled agricultural communities across the Mississippi River valley and beyond, as well as the spread of common cultural practices, architectural styles, and technological advancements.