The United States Constitution is a fundamental document in defining our concept of justice. Strongly influenced in its formulation by John Locke's Second Treatise on Government and Natural Rights theory, some major assumptions of the constition are as follows.
Individuals have natural rights to liberty and their own free pursuit of happiness.
Government is a contract among the governed. Justice is best preserved when government is only through the consent of the governed. Laws must depend on the consent of the government. Representative government is essential to justice. The individual must be protected against the potential power of government.