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See: WWII memorabilia & collectibles.
He is an American, of Japanese ancestry, which means that he is Japanese-American.
japanese-american
See website: Japanese-American internment
There has not been an American and Japanese period.
Seward made the Japanese-American Treaty.
Nikkei is generically a person of Japanese heritage. In Japanese, you'd say "Nikkei America-Jin" for Japanese American.
Which american?
No. He is an American of Japanese ancestry (Japanese-American), originally from the State of Hawaii.
There are several differences between Japanese Google and American Google. The main difference is that Japanese Google is written in Japanese, where as American Google is written in English.
His nationality is American (United States of America, from the State of Hawaii), of Japanese ancestry, which makes his ethnicity Japanese-American.
Japanese