More specifically, you can send the gift but the people will not be able to redeem them. They end up stuck with a useless email. What you can do is send iTunes gift cards. These can be sent electronically and can be purchased for one country's specific store, in your case USA, from another country.
A passport is a travel document, usually issued by a country 's government, that certifies the identity and nationality of its holder for the purpose of international travel.Standard passports contain the holder's name, place and date of birth, photograph, signature, and other identifying information. passport is a document certifying identity and nationality; having the document does not of itself grant any rights, such as protection by the consulate of the issuing country, although it may indicate that the holder has such rights.
Previously, Americans returning from Canada by land had to present a driver's license and birth certificate to prove identification and citizenship. But as of June 1, Americans will need to present a valid travel document to enter the U.S. from Canada, Mexico, the Caribbean islands and Bermuda. What's a valid travel document? A regular passport, a new passport card, a trusted traveler card or an enhanced driver's license, which states the person's nationality. Children under the age of 16 will not be required to have the travel documentation.