Why wasn't my passport stamped at the US border?

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Accepted answer

It sounds like you entered the US under automatic revalidation.

Under automatic revalidation, people who have been admitted to the US in a non-immigrant status can travel to Canada or Mexico (and, for F and J visa holders and VWP participants, various Caribbean islands) for up to 30 days and return to the US under the same admission that they had previously entered under.

This is the so-called 90 day rule that people mention when talking about visiting these places from the US: Because you are admitted under your previous entry, you don't get a new 90 day admission; instead, your previous 90-day admission still applies and you must depart the US before that date.

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