Couldn't return papers to border officials last time. Should I be afraid when going back to USA?

Three years ago I was on holidays in Canada and visited the Niagara Falls. I also went to the American side of the falls and got something like a "short-term visa". I also got a green paper with all my information (name, passport number, etc.) which I should give back at the border when leaving USA again.

When I got back from the USA side of the falls, the border was abandoned. Therefore I couldn't give the green paper back to the officials. Now I'm really a bit afraid that in their computer system I still haven't left the USA.

Next summer I plan to visit USA again. Can I get into trouble at the border?

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What if I forgot to return I-94?

If you used private carrier to depart US, and forgot to turn in the I-94, then you have take steps to correct your records. If you do not correct the records and fail to provide proof that you did not overstay, CBP will conclude that you broke the law.

Does immigration know your travel history?

Answer: The Department of State does not keep records of citizens' travels. The only record of your travels is your passport containing entry and exit stamps. The immigration office of the country/s you traveled to MAY be able to provide you with information on your entry into their borders.

How does U.S. Immigration know when you leave?

By Plane or Cruise ship they know when you left and when you arrived by the ship's manifest and electronic information from security checks on your passport and boarding pass. They know this on everyone including citizens.

How long do you have to leave the U.S. before returning?

There is no set period you must remain outside the USA before returning but: "When traveling to the U.S. with the approved ESTA, you may only stay for up to 90 days at a time - and there should be a reasonable amount of time between visits so that the CBP Officer does not think you are trying to live here.

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