The one about residents voting to raise taxes to support the schools is the answer.
It wouldn’t work without voting because it’s basically all about voting.
Popular sovereignty, at least in theory, gives the people a massive voice and basically absolute power of choice and decision making. The people hold absolute authority over state and government and if they decide it’s not working they have the power to abolish the whole thing and start over.
Overtime it’s evolved and there’s been obviously necessary changes made