Conversational mention of references is not allowed without formal citations to specifically attribute credit. As an example: Bolivar likes dogs so….is incorrect. Bolivar likes dogs so… (Boliver, 2013) is correct.
Settlement in North America has been characterized by successive movements of people across the vast continent from ancient times to the present. How have these various movements of people contributed to the present pattern of subregions? What are some other factors contributing to those patterns?