Which social structure did the Aztecs and the Incas have in common? a collection of city-states that fought for dominance
a coalition of city-states that developed trade alliances
a group of tribes that were unified under one religion
a system of classes that were organized like a pyramid

a system of classes that were organized like a pyramid

Explanation:

In Addition to the Inca social system, the Aztecs had landless serfs and slaves. Therefore, the Pyramid like structure that existed in the society was the common feature of both the Empires.

whose power in the senate is equal to the power of the speaker of the house?

social contract theory basically says that all individuals are born equal, and provided a god given right to consent to be governed. american government is based of this

thomas hobbes and john locke said that we are selfish, individualistic, and constantly at war with each other, therefore we need to be controlled. 

government is defined as the legitimate use of force to control human behavior within territorial boundaries, here comes in hobbes and locke.

hobbes takes the part about controlling human behavior. while locke takes the part of legitimate use of force, since force is not legitimate unless there is consent of the people. 

there are basically 3 goals of the government: 1) maintain order by protecting life and property. 2) providing public goods, those which are typically not provided by the public sector, such as roads and education. 3) promote equality be it political, opportunist or outcome equality.