The USA disallows dual citizenship.  In the governments view it if you
have citizenship elsewhere you have renounced it once you become US
citizen.  Many other governments have a, yeah, whatever, response to
that.  Japan officially does not allow for dual US/Japanese but the
actuallity is complex.  This is in regard to adults.  Children of US/
Japanese parents are allowed dual until becoming adults and then they
are supposed to chose.

On Jul 10, 11:27 am, MonkeyBoy <somewildmon...@yahoo.com> wrote:
> On Jul 10, 10:57 am, "Marvel" <mar...@helpcarl.com> wrote:
>
> > If a Japanese citizen married a U.S. citizen, moved to the U.S. and gained
> > U.S. citizenship would that nullify the Japanese citizenship?
> > Thanks
> > Marvel
> >From what I've been told, one cannot have both US and Japanese
>
> citizenship simultaneously (with the exception of a child whose
> parents are Japanese and American, but that child must choose one or
> the other by age 18, or somewhere about then).  I think it's actually
> Japan that does not allow dual citizenship, not the US.
>
> -MB