Arguably you could say there something of a contract - a written body of rules that define how society functions and how it evolves the body of rules. It's eve

Arguably you could say there something of a contract - a written body of rules that define how society functions and how it evolves the body of rules. It's even voluntary in that you can expatriate. But to expatriate you must find another state to immigrate to, and if you don't like any of the social contracts available then tough luck.