One method is to use file transfer via one of the international network services, like CompuServe. Create the document in Japan, transfer the document file, and open the document in the U.S. To do this, the Macintosh systems, both in Japan and in the U.S., must have KanjiTalk software (the Japanese Macintosh operating system) to display the Kanji characters.
You can get KanjiTalk in the U.S. through a Kanji authorized reseller. Call 1-800-882-8856 to find your nearest Kanji authorized reseller.