Two of the cultural similarities of early river valley civilizations were a. reduction in the amount of food needed b. forming of organized government as population increased c. overpopulation, causing people to move from urban setting to rural one d. conversion of more land to productive fields

Hich explains why the constitution gave congress the power to create a system of federal courts? the constitution wanted congress to share power with the judicial branch. the constitution anticipated the need for courts lower than the supreme court. the constitution wanted congress to share power with the appellate courts. the constitution anticipated the need for courts equal to the supreme court.