What kind of government is characterized as a group of states united by a central authority but retaining local or regional power

Which of the following early north american cultures were known for building wigwams and longhouses? a. eastern cultures b. great plains cultures c. western cultures d. northern cultures

Which factor contributed to the rise of african empires such as ghana and mali?

Which factors slowed population growth in china until the 1300? a. one child policy. b. urbanization c. epidemics. d. warfare