The correct answer to this open question is the following.
The Social Contract from John Locke from The Enlightenment is so influential still today because can be applied to modern politics in the United States and other world democracies.
This can be seen in our society as the "contract" established by citizens and federal governments, in which citizens give some of their liberty so the government can create the rules and regulations to have the proper control of society, by ruling it and protect it. That is why people vote and elect their President and representatives, so they can deliver results and govern with honesty, protect the citizens, and create the economic conditions to grow and prosper.