... any countries' copyright laws ...
Here in Germany, we don't have a "Copyright" but an "Urheberrecht".
One of the main differences is that the "Urheberrecht" does not define the copyright as some kind of (negotiable) property which is owned by some person or company;
instead, it defines that as long as the person who created some work is alive, he or she has the exclusive rights on this work (e.g. the right to allow or forbid somebody to copy the work).
So you definitely do not have any rights on the work created by your spouse.
(Neither after a divorcement, nor while you are married.)
And if you have the copyright of some work in one country (e.g. the USA), this does not automatically mean that you have the copyright in another country, too:
Take the picture of the monkey "Naruto" as an example...
So even if the married couple in your example lives in the USA, they are US citizens and they share the copyright in the USA, only one of the two spouses (the one who actually created the item) has the copyright in Germany.