Hobbes believed that the state of nature is a condition of constant fear and conflict, and that individuals enter into a social contract to escape this state and secure their lives and property.

Locke argued that individuals have a natural right to life, liberty, and property, and that the purpose of government is to protect these rights.

Rousseau believed that individuals should give up their individual wills and submit to the general will of the community in order to achieve true freedom and equality.

Social contract theorists argue that the purpose of a social contract is to establish a legitimate government that has the consent of the governed.

The divine right of kings is a theory that claims that kings have the right to rule by virtue of their divine appointment, rather than through the consent of the governed.

Hobbes believed that the state of nature is a condition of constant fear and conflict, where individuals are in a perpetual state of war with each other.

Locke argued that the purpose of government is to protect individual rights, such as the right to life, liberty, and property.

Critics of the social contract theory argue that it is based on an unrealistic view of human nature, assuming that individuals are rational and self-interested actors who are willing to give up their individual rights for the sake of the common good.

Historical social contract theory is not a recognized type of social contract theory. Classical social contract theory, modern social contract theory, and Marxist social contract theory are the three main types of social contract theory.

Classical social contract theories focus on the state of nature and the reasons why individuals would agree to enter into a social contract. Modern social contract theories focus on the actual social contract itself and the terms and conditions that it imposes on individuals.

Marxist social contract theory argues that the social contract is a tool of class oppression, used by the ruling class to maintain its power and control over the working class.

Divine right of kings is not a key concept in social contract theory, as it is based on the idea that kings have the right to rule by virtue of their divine appointment, rather than through the consent of the governed.

The growing complexity of social problems, such as climate change, economic inequality, and global pandemics, poses a challenge to social contract theory, as it is unclear how these problems can be addressed through traditional social contract mechanisms.

Social contract theory has been used to justify different forms of government, including democratic governments, authoritarian governments, and constitutional monarchies. The specific form of government that is justified depends on the particular social contract theory being used.