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When you are not a citizen of the USA a passport is usually required to enter the US. However, for many years citizens of the USA, Canada and several other Western Hemisphere countries did not need a passport to enter the US. Because of increased security procedures, even US citizens must have a passport or passport card to reenter the US across the US-Canada land border or by sea from the Caribbean after 18 May 2009. Passports have been needed for all entrants by air for a year before that.

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16y ago

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