“… The city only has the power to coax; it does not have an effective power to command so long as we are free. Every tax, every law, every rule the city imposes is an offer, not a command: If you would like to live in this area, then this is what it will cost and these will be the rules. …  The City of Chicago is an entity with a legal standing independent of the people of Chicago. Its liabilities are not the personal liabilities of the people who live here — those liabilities are solely the obligation of that entity. …”