According to Aristotle, why were some people "natural slaves"? Who are these people why was slavery for them natural? Why was slavery "beneficial and just" for them?

Natural slaves are those who don't think .

Explanation:

According to Aristotle, some people are "natural slaves" because they are the property of their master and obey their master in every aspects of their society. Some people are slaves by nature while some are the slaves of the law. The natural slaves are those who have no their own point of view, they only do what their master say to do. These peoples are slaves by soul and there is no other way just to obey their master. Slavery was "beneficial and just" for them because they think that this is an easier life than fighting for their rights.

american troops were forced to withdraw following deadly bombings.

explanation:

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.