Which federalism group was responsible for ruling different regions of a country

there are a number of different ideologies that come into conflict with regard to immigrants and immigration to the us.

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.