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That is relatively new, though. As far as I remember, in the "old days" as a foreigner you got those cardboard slips stapled into your passport which were removed again when you left the country. Today they just do this electronically and keep track of who is in the country by receiving your passport information from the airlines. (You can even check your arrival and departure history online: https://i94.cbp.dhs.gov/I94/#/history-search)

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That link didn't work for me. It said no records found, but I’ve left the USA several times in the past 12 months. Weird.

The US stopped doing it around 2014. They also stopped doing it in JFK before they stopped doing it in LAX; so when I flew in one side of the country and out the other I had to argue with the clerk....

Edit: I see wikipedia mentions the move to electronic record keeping instead of adding it to your passport: https://en.wikipedia.org/wiki/Form_I-94#Automation_at_sea_an...

Are you a U.S. permanent resident or U.S. citizen?

It only works for foreigners, I believe, as U.S. residents don't need I-94 forms (the old cardboard slips). I'm also not sure if it works for Canadians, as Canadians can also travel to the U.S. more easily.

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