Earliest civilizations using a barter system which gave way to importing and exporting of goods

Mesopotamia tribes were likely the starting point of the bartering system back in 6000 BC. Phoenicians saw the process, and they adopted it in their society.

Explanation:

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live

political parties are protected under 6th amendment.