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Yes. It's happened before. After the Boston Marathon bombing there was a "shelter-in-place" order given that prevented anyone from leaving their homes, and subjected residents to military rule (including door-to-door warrantless searches).

And otherwise you create snitch lines for people who sneak out at night time. Kinda like New York did for COVID violators.

It's doable, but not really scalable. I doubt they'll be able to pull that off in every US city simultaneously.

They would ring fence the village / suburb.

I don't see a major difference between nothing entering or leaving an apartment compared to entering or leaving the village / suburb.

Both will run out of food in a similar time span.

Easily. It's just a matter of running through the streets at random and punishing the people they caught badly enough.

Pretty much. In the Uyghur concentration camps they regularly gather up the victims of the camps and have them watch beatings and brutal rapes. I've read that in the testimony of several escapees from the camps. That plus everyone gets "minorly" tortured for not learning Chinese fast enough or minor transgressions like looking away/closing eyes/crying when told to watch a beating.