For the vast majority of international travelers, a passport is a necessity. But why?

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For the vast majority of international travelers, a passport is a necessity. But why?

Why Do I Need A Passport To Travel?

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/f3703b85-a97b-4deb-a906-ae32006587b5/transcript