What were the contributions of classical africa and it's impact

The social contact theory states that

Segregation or discriminatory practices that occur even when there is no explicit legal enforcement

How does the principle of federalism affect the u. s. government? a. it guarantees that the united states will always be a representative democracy b. it ensures that the state governments have greater authority that the federal government c. it creates both separate and overlapping powers for the federal and state governments d. it divides the federal and state governments into three branches