> I cannot 'cite' every aspect of this but:
> 1. AFAIK the USA does does not tolerate its citizens holding
> citizenship of other nations
That's a commonly held belief, but it's not true.
It did have some truth at one time. However, Supreme
Court decisions starting in 1967 as well as State Department
policy changes have made dual citizenship (the holding of
more than one citizenship) open to US citizens.
In particular:
A US citizen can be born with both US citizenship
and another citizenship, and the US has no problem
with him keeping both citizenships.
A US citizen can acquire another citizenship
and he will not lose his US citizenship unless
his intention was to give up US citizenship.
The US does have a "renunciatory statement" in its
naturalization oath, but if the person's original country
does not view that statement as having any effect under
its laws, then the person is also a dual citizen.
> 2. It follows that if a citizen of another nation wishes to take up
> citizenship of the USA the citizen would need to renounce the former
> citizenship as best as he or she is able.
The only renunciation required is the renunciatory statement in the
naturalization oath. But, if the person's original country
does not view that statement as having any effect under its laws,
then the person does not have to take any further steps to attempt
to renounce his original citizenship. So, for example, if a
naturalized citizen's country doesn't view the US renunciatory
statement as having any effect under their laws, but they do have
a renunciatory procedure that the person could manually undertake,
the US does NOT require that person do manually perform
any procedure. They only require the renunciatory
statement in the US naturalization process.
When the original country refuses to let go, and many do,
that person can continue to hold his original passport,
and use it abroad. He must deal with the US as a
US citizen, and obey all the laws that apply to any
US citizen.
> 3. If follows further that if the person takes up foreign
citizenship
> again then AFAIK that person is deemed to renounce USA citizenship.
No. Not unless his intention was to renounce US citizenship.
If his intention was to keep US citizenship then he keeps it.
> Acts such as obtaining a passport from or voting in the elections of
> another country are obvious signs of exercising citizenship of
another
> country (agreed, some countries like NZ allow residents who are not
> citizens to vote, but this would not necessarily stop the USA of
using
> this as citizenship evidence).
None of these will cause loss of US citizenship. Voting in
foreign elections cause loss of citizenship at one time,
but that law was declared unconstitutional in 1967,
and in fact, that case Afroyim v. Rusk, is what lead to the
interpretation of the law so that the prohibitions on
dual citizenship have been eliminated.
The following website describes the US policy on dual
citizenship with references to the various US laws
and cases that led to the current policy.
http://www.richw.org/dualcit/
Stephen Gallagher