I guarantee you that if you fly from NYC to Miami, you will not be asked for your passport after TSA checks. You can freely travel between the states. I think

I guarantee you that if you fly from NYC to Miami, you will not be asked for your passport after TSA checks. You can freely travel between the states. I think that you may be European. Here we have freedom of movement, and used to laugh at the USSR where people needed papers for internal travel. Sad to see it returning, and the Shengen idea now being dead for practical purposes.